Diagnostic trouble code (DTC) information

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

Condition

Diagnostic trouble code (DTC) ECM-6B is stored if the air conditioning (A/C) pressure sensor signal is too high or too low.

Substitute Value

Air conditioning (A/C) shut off.

Possible Source

Signal too high:

Short-circuit to supply voltage in the signal cable
Open-circuit in the ground lead
Contact resistance and oxidation
Defective air conditioning (A/C) pressure sensor.

Signal too low:

Short-circuit to ground in signal cable
Open-circuit in the signal cable
Low pressure in the air conditioning (A/C) system
Contact resistance and oxidation
Defective air conditioning (A/C) pressure sensor.

HINT: A diagnostic trouble code (DTC) may be stored at low temperatures despite the absence of any faults.

Fault symptom[s]

The air conditioning (A/C) system does not operate.