P0769

What it means

P0769 is the generic code for an intermittent fault in the shift solenoid D circuit of an automatic transmission. The transmission control unit has seen the solenoid's electrical circuit or its commanded state drop in and out, rather than fail permanently. Which gear or function solenoid D controls differs between transmissions, so the exact effect depends on the model and gearbox.

Symptoms

• Occasional harsh, delayed or flared gear changes
• Gearbox sometimes drops into limp mode or stays in a fixed gear
• Gearbox warning light or malfunction indicator lamp coming on and going off
• Intermittent loss of a particular gear or no lock-up
• Poorer fuel economy at times
• Fault appearing only when hot, cold or on rough roads

Possible causes

• Intermittent wiring fault or chafed harness between the transmission connector and control unitlikely
• Corroded, loose or contaminated transmission connector or internal harness pluglikely
• Shift solenoid D with an intermittent internal open circuit or short, often temperature relatedlikely
• Low, degraded or contaminated transmission fluid affecting solenoid operation or causing debris in the valve bodypossible
• Low battery voltage or poor earth connections causing unstable supply to the control unitpossible
• Sticking valve in the valve body linked to solenoid Dpossible
• Faulty transmission control unit or outdated software where a known issue is documented for that modelrare

How to diagnose

1. Read all stored and pending codes and note the freeze frame data, such as temperature, speed and load, to see when the fault occurs
2. Check for other transmission or network codes, and check battery condition and charging voltage
3. Check transmission fluid level, condition and smell, following the manufacturer's procedure for that gearbox
4. Inspect the wiring and connector at the transmission and control unit for chafing, water ingress, corrosion and bent or pushed-back pins
5. Wiggle test the harness with live data or a circuit monitor running to see if the fault shows up
6. Measure solenoid resistance and compare it with the specification for that model, checking for a reading that varies with temperature
7. Check the supply and earth to the solenoid circuit and look for shorts to earth or voltage
8. Check for technical service bulletins or software updates for the specific model and gearbox before condemning parts

How to fix

• Repair or replace damaged wiring and clean or replace corroded or faulty connectors
• Replace the faulty shift solenoid D or solenoid pack as the manufacturer specifies for that transmission
• Correct the fluid level, or service the fluid and filter where it is degraded or contaminated
• Clean or repair the valve body if a valve is sticking, or replace it if worn
• Repair battery, charging or earth faults
• Update or replace the transmission control unit only where testing proves it faulty or a known software fault applies

Can I keep driving?

Nearby codes

• P0768GenericShift Solenoid D Electrical
• P076AGenericShift Solenoid H