What does fault code ECM-0643 mean?

Diagnostic fault code details for ECM-0643 (Volvo C30 (2007–2013), Volvo C30 (2007–2013), Volvo C70 (2006–2013)). Repair service at OBD Tuning.

VOLVO

ECM-0643 - Power supply 1. Signal too high

System

Engine Control Module (ECM)

Volvo models this fault code applies to

This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.

Applies to the following models:

4 models

C30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)

Show models by year and engine (10)

What does this fault code mean?

The supply voltage to all emission-related sensors is too high, and the engine control module sets the code. The cause is a supply wire shorted to battery voltage. Sensors receiving too high a supply can give incorrect signals, which may show up as starting problems or poor driving.

Possible causes

Supply wire short-circuited to battery voltage

What you can do

1Inspect the wiring from the engine control module to the sensors for chafing, especially where it could have touched a live wire
2Check that the connectors at the sensors and at the engine control module are tight and clean
3With the ignition off, use a multimeter to check that the supply wire has no contact with battery voltage
4If the fault remains after these checks, have a workshop read the sensors and control module with diagnostic equipment and remedy what is found

Symptoms you may notice3

Starting problems, where the engine does not start at all or starts unreliably
Poor driving or lacking power
Text message in the display

General guidance for car owners. Diagnosis on the car can point to a different cause.

VOLVO

ECM-0643 - Power supply 1. Signal too high

System

Engine Control Module (ECM)

Volvo models this fault code applies to

This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.

Applies to the following models:

4 models

C30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)

Show models by year and engine (10)

What does this fault code mean?

Possible causes

Supply wire short-circuited to battery voltage

What you can do

1Inspect the wiring from the engine control module to the sensors for chafing, especially where it could have touched a live wire
2Check that the connectors at the sensors and at the engine control module are tight and clean
3With the ignition off, use a multimeter to check that the supply wire has no contact with battery voltage
4If the fault remains after these checks, have a workshop read the sensors and control module with diagnostic equipment and remedy what is found

Symptoms you may notice3

Starting problems, where the engine does not start at all or starts unreliably
Poor driving or lacking power
Text message in the display

General guidance for car owners. Diagnosis on the car can point to a different cause.

ECM-0643 - Power supply 1. Signal too high

Volvo models this fault code applies to

Power supply 1. Signal too high

Reference voltage A. Signal too high

Applies to the following models:

What does this fault code mean?

Possible causes

What you can do

Symptoms you may notice3

ECM-0643 - Power supply 1. Signal too high

Volvo models this fault code applies to

Power supply 1. Signal too high

Reference voltage A. Signal too high

Applies to the following models:

What does this fault code mean?

Possible causes

What you can do

Symptoms you may notice3