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P0738 – BMW DTC

BMW DTC P0738 – TCM Engine Speed Output Circuit Low

DTC P0738 meaning on BMW

The Diagnostic Trouble Code (DTC) P0738 for BMW refers to an issue with the Transmission Control Module (TCM) Engine Speed Output Circuit being detected as low. This code indicates that the TCM has detected a lower than expected engine speed signal output from the engine control module.

BMW DTC P0738 symptoms

Symptoms of DTC P0738 on a BMW may include:

  • Harsh shifting
  • Slipping transmission
  • Engine stalling
  • Decreased fuel efficiency
  • Illuminated Check Engine Light

BMW DTC P0738 causes

Common causes of DTC P0738 on a BMW include:

  • Faulty engine speed sensor
  • Wiring or connection issues in the engine speed output circuit
  • Defective TCM
  • Software issues in the TCM

BMW DTC P0738 seriousness

DTC P0738 should be addressed promptly as it can lead to further damage to the transmission system if left unresolved. Ignoring this code may result in transmission failure and unsafe driving conditions.

How to diagnose DTC P0738 on BMW

To diagnose DTC P0738 on a BMW, you can perform the following steps:

  1. Use a diagnostic scanner to retrieve the fault codes
  2. Inspect the engine speed sensor and its wiring for any damage or loose connections
  3. Check the TCM for any signs of malfunction
  4. Perform a road test to observe the transmission behavior

How to fix DTC P0738 on BMW

To fix DTC P0738 on a BMW, you can try the following solutions:

  1. Replace the faulty engine speed sensor
  2. Repair any damaged wiring or connections in the engine speed output circuit
  3. Replace the TCM if found to be defective
  4. Update the TCM software if necessary

How to erase DTC P0738 on BMW

To erase DTC P0738 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the TCM memory. After fixing the underlying issue causing the code, clearing the code will reset the Check Engine Light and ensure proper operation of the transmission system.

Recommended tools & DTC Scanners for BMW

Best Diagnostic App for modern BMWs: BimmerLink

Recommended Bluetooth adapter for Bimmerlink: OBDLink CX

Cable adapter for Bimmerlink: Enet Cable USB Type C

For older BMWs we recommend: Autel AutoLink AL319 (2024 version)

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

← All BMW Diagnostic Trouble Codes

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