What are the P1337 fault codes?
2 Answers
P1337 fault code applies to Mercedes-Benz, meaning Engine Control Module (ECM), RPM Signal Output. Below is relevant information: 1. The Engine Control Module, also known as the Engine Control Unit (in some vehicles, the Engine Control Module and Transmission Control Module are integrated into a Powertrain Control Module), controls the entire operation of the engine. Its primary function is to regulate the optimal fuel injection amount and ignition timing. Another crucial role is monitoring components related to emission control. 2. The P1337 fault code also applies to Audi and Volkswagen, meaning Camshaft Position (CMP) Sensor - Short to Ground (Powertrain System). The camshaft controls the opening and closing of valves. In variable valve timing systems, the electronic camshaft adjustment valve (or Oil Control Valve, OCV) adjusts the camshaft angle by altering the oil pressure to the camshaft adjuster (mechanical) based on commands from the Engine Control Module (ECM), ensuring valves open and close at the optimal time.
I just finished repairing a car and diagnosed the P1337 trouble code, which typically indicates a crankshaft position sensor circuit range or performance issue, meaning the sensor readings are inaccurate causing the engine to fail to recognize its position. Possible causes include loose wiring connectors, sensor aging, or contamination; during high-speed driving, this can lead to sluggish acceleration, unstable idle, or even stalling. If your dashboard light shows P1337, don't panic—first, use an OBD scanner to confirm the code and check the history for other related codes like P1336. I recommend first inspecting the sensor connection for cleanliness or performing a simple resistance test, but in most cases, the entire unit needs replacement. Remember to have the technician visually inspect the sensor during regular maintenance to avoid cumulative issues affecting engine lifespan, addressing it promptly to save on major repair costs.
