Code
P061B
Generic
P — Powertrain
Internal Control Module Torque Calculation Performance
Views:
UK: 13
EN: 20
RU: 15
AI status
Completed
Completed
100%
Causes
- Corrupt or outdated PCM software/calibration
- PCM internal processor or memory fault
- Invalid or missing input signals used for torque calculation (MAF, MAP, TPS/APP, crank/cam, fuel/ignition timing)
- Intermittent or low battery/charging voltage to PCM
- Poor power/ground connections or damaged PCM connector
- CAN bus or module-to-module communication errors
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power or limp-home mode
- Erratic idle, surging or stalling
- Inconsistent throttle response or hesitation
- Transmission shift abnormalities (hard/late shifts) when torque-based shift logic is used
- Loss of certain driver-assist or torque-management functions
What to check
- Read freeze frame and all stored/ pending codes; note operating conditions when code set
- Confirm VIN/calibration ID and compare PCM software version to manufacturer bulletin/TSB
- Check battery voltage and charging system (key on and engine running)
- Inspect PCM connectors for corrosion, bent pins, water intrusion and secure mating
- Verify power and ground circuits to PCM with wiring diagrams, measure voltage and resistance
- Scan live data for torque_calculated vs torque_requested and verify sensor inputs (MAF, MAP, TPS/APP, RPM, ignition timing)
Signal parameters
- Engine Speed (RPM) — should be stable and match tachometer
- Calculated Torque (engine torque estimate) — normally a positive/negative N·m or lb-ft value, expected to change with throttle
- Requested/Commanded Torque — should correlate with accelerator pedal position/APP
- Accelerator Pedal Position (APP) / TPS — 0–100% with smooth travel, no spikes
- MAF (g/s) or MAP (kPa) — within expected range for RPM and load
- Ignition Timing (°BTDC) — not wildly out of expected values
Diagnostic algorithm
- Retrieve all DTCs and freeze-frame data; record operating conditions and any related codes.
- Clear codes and perform a controlled road or dynamometer test to try to re-create the fault while monitoring live data (calculated torque, requested torque, APP/TPS, MAF/MAP, RPM, battery voltage).
- Verify sensor inputs used by torque algorithm: check APP/TPS for smooth operation, verify MAF/MAP for plausibility, and confirm crank/cam sensor signals. Repair any sensor faults first.
- Check power and ground to PCM: measure key-on and engine-running supply voltages, measure ground resistance to chassis/negative battery, inspect for intermittent connections and corrosion; repair as needed.
- Inspect PCM connector and wiring harness for damage, water intrusion, pin corrosion or bent pins. Wiggle-test harness with scan tool monitoring for parameter dropouts.
- Check CAN bus communications: confirm other modules present and communicating, look for bus errors, shorted or open CAN lines and correct wiring faults.
- Compare PCM software/calibration level to latest manufacturer service information; if older or known-issue software exists, perform a reflash/update per manufacturer procedure.
- If software update does not resolve and inputs/power/communications are verified good, consider bench or dealer-level PCM diagnostics (self-tests, extended memory checks). Replace PCM only after confirming a verified internal fault.
- After repairs, erase codes and verify proper operation through road test and re-check for reoccurrence; document software/calibration ID and work performed.
Likely causes
- PCM software bug or corrupted calibration file
- Faulty or intermittent battery/ignition power or ground to PCM
- One or more sensor inputs out of range (MAF, MAP, TPS, APP, crank/cam) feeding bad data into torque algorithm
- CAN bus messages missing or corrupted (loss of engine/transmission data)
- PCM hardware degradation (processor/memory fault) or water/damage at connector
Fault status
Status
PCM has detected invalid or inconsistent torque calculation results or an internal torque-calculation function fault.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P061B
LAND ROVER
P — Powertrain
Performance of torque calculation internal control module
Views:
UK: 6
EN: 9
RU: 6
AI status
Completed
Completed
100%
Causes
- Corrupt or outdated PCM software/calibration
- PCM internal processor or memory fault
- Invalid or missing input signals used for torque calculation (MAF, MAP, TPS/APP, crank/cam, fuel/ignition timing)
- Intermittent or low battery/charging voltage to PCM
- Poor power/ground connections or damaged PCM connector
- CAN bus or module-to-module communication errors
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power or limp-home mode
- Erratic idle, surging or stalling
- Inconsistent throttle response or hesitation
- Transmission shift abnormalities (hard/late shifts) when torque-based shift logic is used
- Loss of certain driver-assist or torque-management functions
What to check
- Read freeze frame and all stored/ pending codes; note operating conditions when code set
- Confirm VIN/calibration ID and compare PCM software version to manufacturer bulletin/TSB
- Check battery voltage and charging system (key on and engine running)
- Inspect PCM connectors for corrosion, bent pins, water intrusion and secure mating
- Verify power and ground circuits to PCM with wiring diagrams, measure voltage and resistance
- Scan live data for torque_calculated vs torque_requested and verify sensor inputs (MAF, MAP, TPS/APP, RPM, ignition timing)
Signal parameters
- Engine Speed (RPM) — should be stable and match tachometer
- Calculated Torque (engine torque estimate) — normally a positive/negative N·m or lb-ft value, expected to change with throttle
- Requested/Commanded Torque — should correlate with accelerator pedal position/APP
- Accelerator Pedal Position (APP) / TPS — 0–100% with smooth travel, no spikes
- MAF (g/s) or MAP (kPa) — within expected range for RPM and load
- Ignition Timing (°BTDC) — not wildly out of expected values
Diagnostic algorithm
- Retrieve all DTCs and freeze-frame data; record operating conditions and any related codes.
- Clear codes and perform a controlled road or dynamometer test to try to re-create the fault while monitoring live data (calculated torque, requested torque, APP/TPS, MAF/MAP, RPM, battery voltage).
- Verify sensor inputs used by torque algorithm: check APP/TPS for smooth operation, verify MAF/MAP for plausibility, and confirm crank/cam sensor signals. Repair any sensor faults first.
- Check power and ground to PCM: measure key-on and engine-running supply voltages, measure ground resistance to chassis/negative battery, inspect for intermittent connections and corrosion; repair as needed.
- Inspect PCM connector and wiring harness for damage, water intrusion, pin corrosion or bent pins. Wiggle-test harness with scan tool monitoring for parameter dropouts.
- Check CAN bus communications: confirm other modules present and communicating, look for bus errors, shorted or open CAN lines and correct wiring faults.
- Compare PCM software/calibration level to latest manufacturer service information; if older or known-issue software exists, perform a reflash/update per manufacturer procedure.
- If software update does not resolve and inputs/power/communications are verified good, consider bench or dealer-level PCM diagnostics (self-tests, extended memory checks). Replace PCM only after confirming a verified internal fault.
- After repairs, erase codes and verify proper operation through road test and re-check for reoccurrence; document software/calibration ID and work performed.
Likely causes
- PCM software bug or corrupted calibration file
- Faulty or intermittent battery/ignition power or ground to PCM
- One or more sensor inputs out of range (MAF, MAP, TPS, APP, crank/cam) feeding bad data into torque algorithm
- CAN bus messages missing or corrupted (loss of engine/transmission data)
- PCM hardware degradation (processor/memory fault) or water/damage at connector
Fault status
Status
PCM has detected invalid or inconsistent torque calculation results or an internal torque-calculation function fault.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
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0
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