Fault code P1847 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P1847 – Transmission Transfer Case Contact Plate 'A' Open Circuit

P1847: Causes, signs and repairs

Error code P1847 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected an error in the automatic transmission control module that affects the transmission control unit. This DTC P1847 is a manufacturer-specific trouble code that mainly occurs in General Motors vehicles and indicates problems with the transmission electronics.

What causes can this error code have?

Defective transmission control unit (TCM)
Damaged cable connections to the transmission control module
Corroded or loose plug connections
Defective transmission sensors
Faulty power supply to the control unit
Internal short circuits in the control module
Defective ground cable of the gearbox
Damaged circuit board in the transmission control unit

What symptoms occur in parallel with error code P1847?

Shifting problems: The transmission shifts irregularly or not at all
Emergency running program: The vehicle stops in one gear
Jerking: Uneven running when accelerating or shifting gears
Starting problems: Engine is difficult to start or stalls
Power loss: Reduced engine power when driving
Transmission protection: Automatic shutdown of the transmission

How can the problem with error code P1847 be rectified?

The repair requires a systematic diagnosis of the transmission electronics and its components.
Replace the transmission control unit completely and have it reprogrammed
Check all cable connections to the TCM and replace damaged cables
Clean plug connections, treat with contact spray and tighten firmly
Measure the power supply to the control unit and check the fuses
Loosen, clean and reattach the gearbox earth connections
Change the transmission oil and set the oil level correctly
Delete error code and carry out test drive to check function

FAQ - Frequently asked questions about DTC P1847

Can I continue driving with fault code P1847?

No, you should not continue driving the vehicle with this fault code. The transmission can switch to emergency mode or fail completely, which can lead to dangerous situations.

How much does it cost to repair fault code P1847?

The repair costs are between 300-1200 euros, depending on the cause. A new transmission control unit costs 800-1200 euros, while cable repairs are usually less than 400 euros.

How long does it take to diagnose code P1847?

The complete diagnosis takes around 1-2 hours. The actual repair can take between 2-6 hours, depending on the cause.

Is fault code P1847 a warranty case?

For newer vehicles under 5 years old, this EOBD code can be a warranty case, especially if it is a defect in the control unit. Check your warranty conditions.

Can I delete the P1847 code myself?

You can delete the trouble code with an OBD scanner, but it will return immediately if the root cause is not rectified. A professional repair is required.

What tools do I need to diagnose P1847?

For a complete diagnosis, you will need a professional OBD scanner, a multimeter and special GM diagnostic software for the transmission control unit.

Vehicles in which fault code P1847 occurs most frequently

Error code P1847 is a manufacturer-specific DTC from General Motors and can occur in various automatic transmissions, but is most common in the following vehicles:

Chevrolet: Silverado, Tahoe, Suburban, Impala, Malibu (2000-2010)
GMC: Sierra, Yukon, Savana, Canyon (2000-2012)
Cadillac: Escalade, DeVille, STS, CTS (2000-2008)
Buick: LeSabre, Park Avenue, Lucerne (2000-2009)
Pontiac: Grand Prix, Bonneville, G6 (2000-2008)
Oldsmobile: Aurora, Intrigue, Alero (2000-2004)
Saturn: Vue, Ion, Aura (2003-2009)
If code P1847 occurs in your vehicle, you should immediately visit a specialist workshop that has experience with GM transmissions. The repair often requires special diagnostic equipment and programming software that is only available at authorized workshops. Do not delay with the repair, as transmission damage can be very expensive.

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