Faulty crankshaft or camshaft position sensor (whichever is the 'B' signal on this engine); Damaged wiring, chafed insulation or poor connector contact in the sensor circuit (signal, reference or earth); Oil, coolant or debris contamination on the sensor or its connector; Damaged, dirty or loose reluctor/trigger wheel or tone ring; Timing belt or chain stretched, jumped a tooth or incorrectly fitted, so crank and cam signals no longer correlate; Incorrect air gap or loose sensor mounting; Fault within the engine control unit.

P0375

Timing Reference High Resolution Signal B.

Generic
Powertrain
Generic code
High severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
3: AreaIgnition system or misfire
75: FaultThe specific fault in that area

What it means

P0375 is a generic powertrain code relating to the timing reference high resolution signal 'B'. This is the engine control unit's way of flagging a fault in a secondary crankshaft or camshaft position signal circuit used for precise engine timing. The ECU has seen a missing, erratic or implausible signal pattern from that sensor or its reference wheel compared with the other timing signal, and what 'B' refers to depends on the engine and manufacturer.

Symptoms

Engine cranks but fails to start or is slow to start
Engine stalls unexpectedly or cuts out while running
Misfire, rough running or hesitation
Reduced power or limp mode
Malfunction indicator lamp on
Poor or erratic idle

Possible causes

Faulty crankshaft or camshaft position sensor (whichever is the 'B' signal on this engine)likely
Damaged wiring, chafed insulation or poor connector contact in the sensor circuit (signal, reference or earth)likely
Oil, coolant or debris contamination on the sensor or its connectorpossible
Damaged, dirty or loose reluctor/trigger wheel or tone ringpossible
Timing belt or chain stretched, jumped a tooth or incorrectly fitted, so crank and cam signals no longer correlatepossible
Incorrect air gap or loose sensor mountingpossible
Fault within the engine control unitrare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting engine speed, load and temperature when the fault set, and check for related crank or cam correlation codes
Look up which sensor the manufacturer assigns to signal 'B' for this specific engine, as this varies by model
Visually inspect the sensor, its connector and the wiring for chafing, heat damage, oil ingress, corrosion or loose pins
Check the sensor is secure and undamaged, and inspect its tip for metal debris or contamination
Check the live data for engine speed and cam/crank synchronisation while cranking and running, comparing with a known-good reference
Test the sensor supply, earth and signal wiring for continuity and shorts, following the manufacturer's procedure
View the sensor signal on a scope and look for dropouts, noise or missing teeth in the pattern
Inspect the trigger wheel and verify the cam and crank timing is correct, if the signal and wiring check out

How to fix

Replace the faulty position sensor with a correct specification part
Repair or replace damaged wiring and connectors, restoring proper contact and insulation
Clean contamination and fix the source of any oil or coolant leak affecting the sensor
Replace or correctly refit a damaged or loose trigger wheel
Correct the valve timing, replacing the belt or chain components as needed
Update or replace the engine control unit only if a fault is confirmed and the manufacturer procedure calls for it

Can I keep driving?

High severity

Avoid driving the car until it is diagnosed, as it may stall without warning, which is a safety risk, and incorrect timing can cause engine damage. If it is running normally, limit use to getting it to a workshop.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.