Code Definition

P0370 — Timing Reference High Resolution Signal A Malfunction

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0370

P0370 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0370 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0370 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The powertrain control module (PCM) sets this code when it detects an issue with the high-resolution timing reference signal 'A' from the engine's crankshaft or camshaft position sensor. This signal provides precise timing data for fuel injection and ignition events. A malfunction can occur if the signal is missing, erratic, or outside the expected range, leading to drivability issues such as misfires, rough idling, or engine stalling.

Quick Facts