Error code

OBD2 P0370

OBD2P0370
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Timing Reference High Resolution Signal 'A'.

Severity

moderateCan be driven, but performance issues and increased fuel consumption may occur.

Summary

P0370 indicates a malfunction in the high-resolution timing reference signal 'A', which is crucial for engine control and monitoring functions like ignition timing and fuel injection.

Symptoms

  • Stored trouble code and an illuminated warning light
  • Poor engine performance
  • Severe misfires
  • Hard or no start condition
  • Increased fuel consumption

Common Causes

  • Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors
  • Defective engine position sensor (crankshaft/camshaft position sensor)
  • Clogged or damaged reluctor ring
  • Failed or failing PCM

Diagnosis

  1. Record all fault codes and freeze frame data.
  2. Inspect the entire wiring harness for damage or corrosion.
  3. Perform reference voltage (if applicable), resistance, continuity, and ground integrity tests on associated wiring.
  4. Disconnect the sensor from its wiring and test it with a multimeter during engine cranking.

Fixes

  • Replace damaged wiring or connectors.
  • Clean or replace the reluctor ring if clogged or damaged.
  • Replace a defective engine position sensor with an OEM part.

FAQ

What is the high-resolution timing reference signal?

It's a critical signal generated by the crankshaft or camshaft position sensor that helps the PCM control and monitor engine functions.

How do I know if my reluctor ring needs cleaning or replacement?

Inspect it for clogs, damage, or broken teeth. If issues are found, clean or replace as necessary.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

More OBD2 codes

All OBD2 codes →Search more codes →