P167C

Code

LAND ROVER P — Powertrain

powertrain control module network

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 13 EN: 23 RU: 13

AI status

Completed

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Page language: EN

Causes

Open or short in CAN/communication wiring (pins, splices, chafing)
Corroded/loose connector(s) at PCM or other modules
Poor battery voltage or weak/poor ground connection
Failed PCM or another module on the same network
Blown fuse or relay supplying the PCM or bus transceivers
Aftermarket electronic device interfering with the bus

Symptoms

Malfunction Indicator Lamp (MIL) illumination
Multiple control modules reporting communication-related faults
Intermittent or no engine start/crank issues
Loss or intermittent operation of instrument cluster, ABS, traction control or transmission functions
Random or multiple unrelated warning lights
Erratic behavior of vehicle systems that rely on PCM data

What to check

Perform a full module network scan with a capable scan tool; record all U-codes and freeze frame data
Check battery resting and cranking voltage (battery fully charged, >12.4 V at rest; >10 V while cranking)
Visually inspect PCM connectors, harnesses, junctions and any pin corrosion or water entry
Check related fuses and relays for PCM and network power/ignition circuits
Measure CAN_H and CAN_L voltages at the PCM with ignition ON (engine OFF)
Measure termination resistance between CAN_H and CAN_L (~60 ohms expected with ignition off)

Signal parameters

CAN bus recessive state: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both lines near mid-rail)
CAN bus dominant state (active): CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (approximate)
Termination resistance (two 120 Ω resistors in parallel): ≈ 60 Ω between CAN_H and CAN_L with ignition off
Expected steady bus voltage and stable frames when vehicle is in a known state; large deviations or stuck-dominant condition indicate a short/fault

Diagnostic algorithm

Retrieve and record all DTCs (including U-codes) and freeze frame data with a capable diagnostic tool.
Verify battery voltage and good chassis/body/engine grounds before continuing.
Visually inspect PCM connector, wiring harnesses, nearby chafe points, and any modules tied to the same bus for damage/corrosion/water entry.
Check fuses/relays that supply PCM and network transceivers; replace if blown and inspect for root cause.
With ignition ON (engine OFF) measure CAN_H and CAN_L at the PCM: compare to typical idle voltages (~2.5 V). If bus lines are stuck high or low, isolate by disconnecting modules one at a time to locate the shorting node.
Measure termination resistance between CAN_H and CAN_L with ignition OFF; expect ≈60 Ω. Very high/low values indicate missing terminator or short.
Use lab scope or scan tool to view CAN waveform for dominant/recessive transitions and bus errors (error frames, voltage spikes).
If a module is identified as causing the fault, swap with a known-good module where possible or replace the faulty module. If no hardware fault is found, check for available PCM/module software updates and perform reprogramming as recommended by the manufacturer.
After repairs, clear codes and perform a road test and repeat module scan to verify the issue is resolved.

Likely causes

Damaged or chafed CAN H/CAN L wiring between modules
Corroded PCM connector or pin (water/dirt)
Blown PCM power/ignition fuse or poor battery ground
Faulty PCM transceiver or another module pulling bus lines dominant
Intermittent connection at a junction or splice due to movement or corrosion

Fault status

⚠️ Status

PCM network communication fault — lost or invalid messages on the vehicle data bus. Inspect wiring, connectors, fuse/power/ground and module operation.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5 - 4.0 hours

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