Code
P1336
FIAT
P — Powertrain
Torque control request fault
Views:
UK: 3
EN: 10
RU: 8
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring/connectors between control modules (ECU, TCM, ESP/TCM, throttle body)
- Lost or intermittent CAN-bus communication carrying the torque request message
- Faulty accelerator pedal position sensor(s) or throttle position sensor
- Faulty electronic throttle actuator or motor
- Low or unstable battery/charging voltage or poor ground
- Software/firmware issue or configuration mismatch after module replacement
Symptoms
- Malfunction Indicator Lamp (MIL) or warning light illuminated
- Reduced engine power or limp-home mode
- Loss of cruise control or reduced cruise functionality
- Hesitation, poor throttle response or unresponsive accelerator
- Transmission may behave unusually if torque request not received
- Possible intermittent starting or stalling in extreme cases
What to check
- Read DTCs and freeze-frame data; note related codes and battery voltage at time of fault
- Inspect wiring and connectors for throttle body, accelerator pedal, ESP/TCM and ECU for damage or corrosion
- Check battery voltage and main ground connections
- Scan CAN-bus for errors and verify torque-request CAN messages are present
- Compare accelerator pedal sensor(s) and throttle position sensor live data for plausibility
- Perform basic actuator tests (throttle body learn, command throttle) using manufacturer scan tool
Signal parameters
- Accelerator pedal sensor voltages: typically redundant channels (e.g., 0.4–4.5 V range) and consistent ratio between sensors
- Throttle position sensor (TPS) voltage/percent and commanded vs actual throttle angle
- Torque request value reported on CAN (Nm or % torque) and message rate/ID — should be present and consistent
- CAN bus status: no bus-off, no excessive errors, nominal dominant/recessive voltages
- Battery system voltage: stable ~12–14.5 V during tests
- Actuator current or duty cycle when throttle is commanded
Diagnostic algorithm
- Read and document P1336 and any other stored/active codes. Capture freeze-frame and live data.
- Check battery voltage and ground integrity. Repair poor battery/ground connections before further testing.
- Visually inspect connectors and wiring for throttle body, APP, ESP/TCM and ECU. Repair any damage/corrosion.
- Using a capable scan tool, monitor live data: accelerator pedal sensors, commanded torque request, desired torque, throttle position, and CAN message presence.
- If pedal sensors or TPS show out-of-range or inconsistent values, test sensor voltages with a DMM and replace faulty sensors.
- Verify CAN communication: check for U-codes, message frequency and proper IDs. Repair short/open on CAN if messages missing.
- Perform actuator/throttle body tests (learn, command open/close) from the scan tool. If throttle motor does not respond or shows abnormal current, consider throttle assembly replacement.
- If wiring and sensors are good but messages are absent from a specific module (ESP/TCM), check power/ground and replace or reprogram the faulty module as per manufacturer procedures.
- Clear codes and perform a road test to confirm fault does not return. If persistent, escalate to manufacturer technical bulletins or advanced diagnostics.
Likely causes
- Open/short in CAN or torque-request signal wiring
- Corroded connector at throttle body or traction-control module
- Faulty pedal or throttle sensors producing out-of-range/erratic voltages
- Intermittent power/ground to modules causing message loss
- Module software incompatibility after replacement or update
Fault status
Status
Torque control request fault — requested torque signal missing, invalid or communications failure detected. Torque control may be disabled until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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