Code
P1337
FIAT
P — Powertrain
Torque control comparison fault
Views:
UK: 2
EN: 4
RU: 3
AI status
Completed
Completed
100%
Causes
- Faulty torque sensor or torque signal (where fitted)
- Accelerator pedal or throttle position sensor faults
- Boost/airflow sensors (MAP, MAF) giving incorrect readings
- ECU-to-ECU communication errors (CAN bus) or missing torque messages
- Wiring or connector faults (open, short, corrosion, poor ground)
- Turbocharger/boost system leak or actuator fault
Symptoms
- Malfunction indicator lamp (MIL) or engine warning light ON
- Reduced engine power or limp-home mode
- Poor throttle response, hesitation or surging under load
- Unexpected torque limiting during acceleration
- Diagnostic trouble codes stored (may include related sensor codes)
What to check
- Read and record all stored DTCs and freeze-frame data with a professional scan tool
- Compare requested/target torque vs. actual torque values in live data
- Check for related codes (throttle, pedal, MAP, MAF, crank/cam, CAN communication)
- Inspect wiring and connectors for sensors involved (torque, MAP/MAF, pedal, throttle)
- Measure battery and charging system voltage under load
- Verify ECU and TCU software/part numbers and look up Technical Service Bulletins
Signal parameters
- Requested/target engine torque (Nm or %)
- Actual/estimated engine torque (Nm or %)
- Accelerator pedal position (%)
- Throttle position / throttle actuator status (%)
- Engine speed (RPM)
- Vehicle speed (km/h or mph)
Diagnostic algorithm
- Connect a full-function scan tool, read all DTCs, capture freeze-frame and live data showing requested vs actual torque.
- Note conditions when fault occurred (load, RPM, temperature) and attempt to reproduce. Clear codes and retest to confirm persistence.
- Verify related sensor values (accelerator pedal, throttle position, MAF, MAP, boost) operate plausibly and respond to input.
- Inspect wiring, connectors and grounds for damage, corrosion or poor connections on all relevant circuits. Repair as needed.
- Check CAN bus communication: verify modules are present, check CAN fault counters and monitor torque-related messages between ECUs.
- Test throttle actuator and pedal sensors for correct redundancy (if applicable) and replace faulty components per manufacturer procedure.
- Inspect intake/boost system for leaks, stuck wastegate or turbo actuator faults; repair any mechanical causes of reduced torque.
- If sensors and wiring OK, check for required ECU/TCU software updates or calibration resets. Reflash or perform torque adaptation reset if advised by manufacturer.
- After repairs, clear codes and road-test under the conditions that previously produced the fault. Reconfirm live torque comparison and absence of DTC.
- If fault persists, consider module bench testing or replacement following manufacturer diagnostic flow; consult technical bulletins or dealer support.
Likely causes
- Corroded connector or damaged wiring on torque-related sensor circuit
- Failed accelerator pedal position sensor or throttle body
- Faulty MAP/MAF or boost sensor causing erroneous torque calculation
- CAN bus error between engine control module and transmission or traction control module
- Software bug or need for ECU/TCU reflash or torque adaptation reset
- Vacuum or boost leak reducing available torque
Fault status
Status
Torque control comparison fault: the control system detected a discrepancy between commanded and measured engine torque. May cause reduced power or limp mode. Further diagnosis required to identify sensor, wiring, communication or mechanical cause.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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