Code P1336: meaning, causes, and how to fix it [complete guide]

“P1336 is not a component failure but a signal that the PCM has lost the crankshaft variation calibration or is receiving an unstable signal from the crankshaft position sensor. The code often returns not because of the sensor itself, but due to a missed CASE Relearn procedure after component replacement. I will explain how the PCM decides to set P1336 and what to check first to avoid replacing parts blindly.”
– Daniel Brooks, automotive diagnostics engineer, DecodeAuto

Quick answer and what to do now

P1336 most commonly means: the PCM has not learned the crankshaft variation (CASE Relearn) or is receiving an incorrect signal from the crankshaft position sensor (CKP). The result is misfires, unstable idle, stalling, or a no-start condition.

Immediately:

• Read codes with a scanner
• Check power, ground, and the CKP connector
• Perform CKP relearn (CASE) on supported brands, especially GM
• Clear codes and perform a test drive

Do not delay if the engine stalls or backfires—catalytic converter and engine damage may occur. In such cases, use a tow truck.

“Top 3 causes: 1) CKP or gap; 2) Wiring or connector; 3) Tone ring or flywheel. What to do: 1) Scanner plus freeze frame; 2) Inspection, power, ground; 3) CASE, if GM.”

Common accompanying codes: P0335/P0336 (CKP), P0300 (misfires), P0725 (engine speed).

This information is general and does not replace professional consultation.

P1336 vs P0335/P0336: what’s the difference

P1336 indicates that the PCM cannot use the CKP signal to accurately calculate crankshaft position—either the variation learning (CASE) is incomplete or the signal is unstable due to mechanical defects (flywheel tone ring, sensor gap).

P0335 – complete loss of CKP signal (open circuit, faulty sensor, no pulses).
P0336 – CKP signal present but out of range (interference, incorrect gap, defective tone wheel).

Key distinction:

• P0335/P0336 – issues with the sensor or its circuit.
• P1336 – PCM calibration problem or mechanical mismatch (tone ring/flywheel).

What to check first:
If P1336 appears with P0335/P0336 – start with CKP and wiring. If only P1336 – perform CASE Relearn (GM) or inspect the flywheel tone ring.

What does error code P1336 (DTC P1336) mean?

Diagnostic trouble code DTC P1336 indicates a fault in the ignition or synchronization system when the PCM does not receive a correct signal from the crankshaft position sensor (CKP) or the crankshaft variation is not learned. The code interpretation varies by brand, but the essence is the same: the PCM cannot reliably interpret the sensor signal, disrupting ignition timing and injection calculations.

How the PCM decides to set P1336:

The PCM continuously compares the CKP signal with a reference crankshaft variation map stored in memory after the learning procedure. If the deviation exceeds the allowable threshold, the PCM stores the code. On GM platforms, this occurs after PCM, CKP sensor replacement, or battery disconnection without a subsequent CASE Relearn—the PCM attempts to operate with outdated calibration and detects a mismatch.

The PCM does not set P1336 instantly but after several cycles verifying conditions: stability of intervals between CKP pulses, correlation with camshaft position sensor (CMP) signal, deviation of variation from the reference map.

“The PCM compares intervals between tone wheel teeth with the reference map. Two consecutive cycles with deviation beyond the threshold trigger the code.” – GM Factory Service Manual, Gen III engines

Meaning of code P1336 by brand (comparison)

Note: Wording depends on PCM generations. Check the OEM TSB/service manual for the specific model and year.

Peugeot: P1336 – what to do

On Peugeot/Citroën vehicles (especially EP6 engines: 106, 107, 108, 2008, 206, 207, 208, 3008, 306, 307, 308, Partner, Rifter, Traveller), P1336 is often related not to the CKP sensor itself but to misfires that the PCM interprets as an unstable crankshaft signal.

Mini diagnostic algorithm:

1. Check CKP–tone ring gap: should be 0.031–0.047 in. (0.8–1.2 mm) (verify in the manual). Incorrect gap causes intermittent signal.
2. Inspect sensor bracket: cracks or play cause gap fluctuations.
3. Check ground and noise: oxidized engine ground or ignition system interference.
4. Rule out EP6 misfires: P030x codes (spark plugs/coils) often accompany P1336.

• Replace spark plugs and coils, check compression.
• If misfires persist – inspect valve seats (a common EP6 issue).

“On EP6 engines, P1336 is often caused by misfires from worn plugs or coils, not the sensor itself. The PCM interprets unstable RPM as a CKP failure.” – Dmitry Sapko, YouTube, 15.06.2025

Peugeot/Citroën models with EP6 (1.6 VTi): 106, 107, 108, 2008, 206, 207, 208, 3008, 301, 306, 307, 308, 4007, 4008, 405, 406, 407, 408, 5008, 508, 605, 607, 806, 807, Boxer, Expert, Partner, Rifter, RCZ, Traveller.

If the code remains after replacing plugs and coils: contact a dealer for a TSB check by VIN—there may be PCM software updates or adaptation procedures.

Symptoms of malfunction with code P1336

Symptoms:

• Check Engine light on; misfire symptoms may be present
• Engine hard to start or won’t start; sometimes stalls while driving
• RPM fluctuates at idle, misfires occur
• Power loss, sluggish acceleration, jerking
• Unstable spark timing or knock, increased fuel consumption
• Scanner shows misfire counters, unstable CKP signal, fluctuating corrections

“Misfires cause vibrations and rough engine operation; flashing Check Engine signals severe misfires risking catalytic converter damage.” – iCarsoft, 2023

Main causes of error P1336

Most frequent causes:

1. Faulty crankshaft position sensor (CKP) or incorrect gap to the tone wheel
2. Damaged wiring or shielding, oxidized connector, poor contact
3. Defects in the tone wheel or flywheel: cracks, chipped teeth, runout
4. Errors after timing or flywheel work: misalignment, incorrect mark
5. PCM malfunction: outdated software, internal fault
6. Low power or ground voltage, voltage drops during cranking, aftermarket alarm interference

“CKP sensor failure is a common cause of P1336, resulting in loss of synchronization signal. Wiring or connection damage to CKP or CMP is also a frequent cause, causing intermittent signals.” – iCarsoft, 2023

How to diagnose error P1336: step-by-step guide

Diagnosis follows the principle “from simple to complex”—start with obvious failure points (connector, wiring), then electrical parameters, and only then analyze signal waveform.

Step 1. Scanner: read P1336 and related codes (P0335/P0336/P0300/P0725). Check freeze frame and monitor readiness. Clear codes, restart or take a short drive to reproduce. Freeze frame shows RPM and load when the code was set—this helps determine if the problem occurs at idle or under load.

“Freeze frame shows RPM, load, and temperature at code set—this narrows the search: idle, start, or acceleration.” – OBD-II diagnostic methodology

Step 2. Inspection: check wiring and connector of the crankshaft position sensor (CKP), shielding integrity, engine ground points. Ensure the connector is dry and contacts are tight. Oxidized contacts cause intermittent signals—the PCM interprets this as a calibration failure.

Step 3. Multimeter: check 5 V power supply (for Hall sensors) and ground; measure CKP resistance (VR type)—compare with the manual (verify OEM range for your engine; examples: GM L61/PSA EP6—check factory specs). Continuity-test wiring and connector from CKP to the PCM.

Step 4. Oscilloscope: evaluate the CKP signal during cranking, at idle, and with throttle input—tone wheel shape, amplitude, dropouts. Compare CKP with CMP (phase synchronization). Unstable waveform or dropouts indicate gap, flywheel, or harness issues. Look for amplitude “dips” at specific teeth—a sign of tone wheel defect.

“VR sensor waveform during cranking: sine wave about 0.5–2 V peak-to-peak (depends on gap and RPM). Dropout on one tooth indicates tone ring defect.” – Basic CKP signal analysis method

Step 5. PCM: check software and updates, perform CASE Relearn or basic settings. If learning fails—return to mechanical checks: CKP gap, flywheel tone ring, pulley vibrations.

Step 6. Validate repair: erase DTC, road test 6–9 miles (10–15 km) with logging of RPM, misfires, and crankshaft speed. Confirm P1336 does not return.

Key tools: OBD-II scanner, multimeter, oscilloscope or data logger, feeler gauges. Always document results before replacing parts—this reduces errors and costs.

Note: Parameters depend on manufacturer; consult your vehicle’s OEM manual.

Methods to fix fault code P1336

To fix or resolve P1336, start with simple steps: repair or clean the CKP connector and wiring, check power and ground, remove oxidation. If the crankshaft position sensor (CKP) is faulty—replace it while maintaining the correct gap. On GM vehicles, the “adaptation or variation learning” (CASE Relearn) step in the PCM is critical; without it, the code will return even after repair. For tone wheel or flywheel damage—mechanical repair is required. After work, clear codes and perform a verification drive with parameter logging. If the fault is PCM-related—check software updates and controller integrity; reflash or replace if necessary. Always use quality parts and verify results with a scanner.

CKP adaptation/learning (CASE Relearn) in PCM

CASE Relearn is a procedure where the PCM measures intervals between pulses from each tooth of the tone wheel and stores a “variation map.” This map is used for accurate crankshaft position calculation and misfire detection.

Conditions for performing:

• Engine warmed up (coolant temperature normal)
• No active CKP, CMP, or knock codes
• Parking brake engaged, automatic transmission in “P” or “N”
• Scanner supports the function (mandatory for GM: Tech 2, Snap-on, Autel with CASE function)

General algorithm (GM):

1. Select service function “Crankshaft Position Variation Relearn”
2. Follow prompts: hold RPM as indicated by the scanner (typically 3,000–5,150 rpm, then sudden throttle release)
3. Confirm successful learning
4. Clear DTC
5. Test drive with logging of RPM and misfires

“A CASE learn must be done if diagnostic trouble code P1336 is present or the crankshaft position sensor has been replaced.” – GM Factory Service Manual, Scribd
“It’s still important to do a crank position relearn after ECM replacement, otherwise your misfire counters might not be as accurate.” – NAPA Echlin, June 18, 2024

If CASE Relearn does not complete:

• Check coolant temperature: must be within operating range (verify in the manual).
• Ensure the transmission is in Park or Neutral.
• Check RPM: the PCM will not start the procedure if RPM is outside scanner range.
• Check brake pedal: hold or release as directed by the scanner.
• Ensure the A/C is off, wheels blocked, parking brake engaged.
• If conditions are met but the procedure fails—return to mechanical checks: CKP gap, flywheel tone ring, ground points.

Repair of CKP wiring and connector

Clean contacts, repair damaged wires, check shielding and routing away from ignition wires and solenoids. Use heat-shrink or solder per OEM standards; use dielectric grease for sealing. CKP harness shielding is critical—ignition interference can mimic sensor failure.

Crankshaft position sensor (CKP) replacement

Select by VIN, maintain gap to the tone wheel (per manual; verify OEM spec—typical range 0.020–0.059 in. (0.5–1.5 mm) for VR), torque the bolt properly. After replacement—perform adaptation or basic settings and clear codes. Check gap with a feeler gauge before tightening.

Inspection of tone wheel/flywheel

Check for cracks, chipped teeth, runout; repair mechanical defects. A single chipped tooth can cause waveform dropout and trigger P1336 even if the sensor is good.

“Chipped teeth on the flywheel tone ring cause P1336—the PCM detects a missing 1° signal at startup.” – Carsntoys, YouTube, 25.12.2014

Code clearing, PCM software update

Clear DTC, check for software updates, perform “basic settings” or “CKP identification” if supported by the manufacturer.

Brand-specific features and related codes

GM: CASE Relearn is mandatory

Without crankshaft variation learning, P1336 returns even after CKP replacement. Often accompanied by P0300, P0335, and engine shaking on throttle release. Perform GM’s “Crankshaft Position System Variation Learn” procedure.

“On GM platforms, after any crankshaft or flywheel work, CASE Relearn is not optional but required. Without it, the PCM tries to operate with outdated calibration, causing the code even with good components.”

PSA (Peugeot/Citroën): CKP gap and tone ring

Sensitive to CKP–tone ring distance; check mounting and bracket. False misfire counts may occur due to ground noise.

“On EP6 engines, P1336 is often caused by misfires from worn plugs or coils, not the sensor itself.” – Dmitry Sapko, YouTube, 15.06.2025

Nissan/Infiniti: CVT/harness influence

Engine speed signal interference (P0725) can be mistaken for P1336. Inspect the harness over the crankcase and ground points first.

“Chipped tooth on the flywheel tone ring is a common cause of P1336 on Nissan/Infiniti.” – Carsntoys, YouTube, 25.12.2014

Hyundai/Kia, VAG, Toyota

Often “range/performance” issues with CKP; check sensor type (Hall/VR) and 5 V power supply.

Cost, repair time, and common diagnostic mistakes

Diagnosis: 0.5–1.5 hours; price depends on oscilloscope use and diagnostic depth.

CKP replacement: 0.5–2.0 hours plus parts cost; OEM or OE supplier parts preferred. Average CKP replacement cost on a Chevrolet Cruze (2016–2019) can be about $155–$226, including parts and labor, based on US market data (verify local pricing).

Common mistakes:

• Replacing the sensor blindly without checking the harness or gap
• Ignoring the relearn procedure
• Confusing CKP and CMP sensors
• Misinterpreting fluctuating waveforms caused by battery voltage drops

Recommendation: document every step (scanner screenshots) to save time and money.

Note: Prices are approximate for the US/EU and valid for 2026. Check local costs.

Tools and materials

Tools:

• OBD-II scanner with service-function support (CASE Relearn or basic settings)
• Multimeter, oscilloscope, or lab data logger
• Probes, piercing probes
• Socket set or torque wrench, feeler gauges

Materials:

• Contact cleaner
• Dielectric grease
• Heat-shrink tubing, harness tape, or clips
• OEM manual or access to TSBs and wiring diagrams

Safety: when to drive and when to tow

Driving is advisable only if the engine runs smoothly without stalling or backfiring, and even then load should be kept low. The PCM may enter a reduced-power strategy, but this does not guarantee stable operation during sudden acceleration.

Towing is required if:

• Engine stalls
• Backfires in the exhaust or intake
• Severe vibrations occur
• Flashing Check Engine light (active misfires)

“Flashing Check Engine signals severe misfires risking catalytic converter damage from unburned fuel.” – iCarsoft, 2023

Always disconnect the battery before working with connectors or sensors.

Prevention and how to avoid P1336 in the future

Prevention: regularly inspect the crankshaft position sensor (CKP), its mounting and gap; monitor wiring and ground condition. Contact oxidation can begin long before failure—annual connector inspection can save time.

Recommendations: use quality parts and harnesses, protect the PCM from corrosion and moisture, keep the battery in good condition. Low voltage during cranking can cause “noise” in the CKP signal—the PCM interprets this as a fault.

To avoid repeated P1336, perform the relearn after timing or flywheel work and document parameters with a scanner.

Note: Parameter values and procedures should be verified in your model year’s service manual. This content is for educational purposes only, does not replace professional inspection, and is not a repair manual.