P1C77 – BMW DTC

BMW DTC P1C77 – Universal Charger Extension Control Module DC/DC Converter High Voltage Current Sensor Circuit Current Implausible Low

DTC P1C77 meaning on BMW

DTC P1C77 on a BMW refers to the Universal Charger Extension Control Module DC/DC Converter High Voltage Current Sensor Circuit Current Implausible Low fault. This fault code indicates that the control module has detected an implausibly low current reading from the high voltage current sensor circuit in the DC/DC converter.

BMW DTC P1C77 symptoms

Symptoms of BMW DTC P1C77 may include:

• Check Engine Light (MIL) illuminated
• Reduced power or performance
• Issues with charging the high voltage battery

BMW DTC P1C77 causes

Possible causes of BMW DTC P1C77 include:

• Faulty high voltage current sensor
• Wiring or connection issues in the sensor circuit
• Malfunctioning Universal Charger Extension Control Module

BMW DTC P1C77 seriousness

The seriousness of DTC P1C77 on a BMW depends on the underlying cause. Ignoring this fault code can lead to charging issues and potential damage to the high voltage system. It is recommended to address this issue promptly to prevent further complications.

How to diagnose DTC P1C77 on BMW

To diagnose DTC P1C77 on a BMW, you can perform the following steps:

1. Use a diagnostic scanner to retrieve the fault code and related data
2. Inspect the high voltage current sensor and its wiring for any visible damage
3. Check the Universal Charger Extension Control Module for proper operation
4. Perform a circuit test to verify the sensor’s readings

How to fix DTC P1C77 on BMW

To fix DTC P1C77 on a BMW, you may need to:

1. Replace the faulty high voltage current sensor
2. Repair any damaged wiring or connections in the sensor circuit
3. Inspect and potentially replace the Universal Charger Extension Control Module if necessary
4. Clear the fault code and perform a test drive to ensure the issue is resolved

How to erase DTC P1C77 on BMW

To erase DTC P1C77 on a BMW, you can:

1. Use a diagnostic scanner to clear the fault code
2. Perform a battery reset by disconnecting the vehicle’s battery for a few minutes
3. After clearing the code, monitor the system for any reoccurrence of the fault

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

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