Fault code 26 - Washing Machines

between the compressor's main control board and the user interface board. This can cause the compressor to trip with a USD (Unexpected Shutdown) fault.
To troubleshoot this issue, here are a few steps you can take:

1. Check the communication cables between the main control board and the user interface board. Make sure they are securely connected and not damaged.
2. Check the power supply to the user interface board. Make sure it is receiving the correct voltage and that the wiring is not damaged.
3. Check the user interface board for any damage or loose components. If there are any damaged components, they will need to be replaced.
4. If the issue persists, you may need to replace either the main control board or the user interface board.

It's important to note that working on compressors can be dangerous and should only be done by qualified technicians. If you're not familiar with the inner workings of the compressor or don't feel comfortable troubleshooting the issue yourself, it's best to contact a qualified technician or the manufacturer for assistance.

GM OBD Trouble Code 26
Quad Driver Module (QDM A) Error The ECM uses "quad drivers" to control its output devices. Each quad driver is capable of controlling up to four devices.
Fault Code Description

• 26 - Quad Driver Module (QDM A) error

Symptoms

• Improper operation of an ECM-controlled device

Common Problems

• Code 26 does not mean there is an internal ECM failure
• Code 26 can indicate a circuit problem (open or shorted) in one of the devices controlled by QDM A
• Some diagnostic charts may state which devices are controlled by QDM A. In other cases, it may be necessary to monitor which ECM-controlled devices are operating when the Check Engine Light comes on in order to determine which circuit is causing the problem.

please seek the advice of a professional Service Technician.

AS THAT CODE COULD BE MANY THINGS ON MOST CARS

EOBD II Error Code: 25
Description:
System too Lean, Bank 1
Possible Causes:
- Intake/exhaust leak.
- Secondary air injection (AIR) system.
- Manifold absolute pressure (MAP) sensor.
- Mass air flow (MAF) sensor.
- Fuel pressure/pump.
- Injector(s).
- Evaporation emission (EVAP) canister purge valve.
- Heated oxygen sensor (HO2S).
- Contaminated fuel.

EOBD II Error Code: 26
Fault Location:
System too Rich, Bank 1
Description:
- Evaporation emission (EVAP) canister purge valve .
- Fuel pressure.
- Injector(s).
- Heated oxygen sensor (HO2S).
- Contaminated fuel.
Hope that works.

code 26 is .... Quad Driver (QDM) "A" Fault
code 42 is ..... Electronic Spark Timing (EST) Circuit

Trouble Code #26 means "Idle Speed Control (ISC) motor/throttle switch circuit fault (short)

code 26 quad-driver module (computer) circuit #1 fault
replace the computer.

Check your compressor

Either do a search in bimmerfest.com or a Google search on BMW fault codes.

This is what the fault means:
Motor Drive System Failure F-26 flashes if there is a motor drive system
failure. See TEST #3 in manual


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