Fault code P1701 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P1701 – Reverse Engagement Error

P1701: Causes, signs and repairs

Error code P1701 is displayed and the check engine light is on - what does this mean?

The DTC P1701 is a manufacturer-specific fault code that is recognized by the OBD system and indicates a problem with the transmission control module or the communication between the engine control unit and the transmission control unit. This trouble code mainly occurs in Ford vehicles and can affect the shifting functions of the automatic transmission.

What can cause this error code?

Defective transmission control module (TCM)
Damaged wiring harness between ECM and TCM
Corroded or loose plug connections
Faulty power supply to the transmission control module
Defective CAN bus connection
Damaged fuses in the transmission control circuit
Software error in the engine control unit

What symptoms occur in parallel with error code P1701?

Shifting problems: The automatic transmission shifts irregularly or gets stuck in a gear
Emergency running program: The transmission switches to safety mode with limited functionality
Starting problems: The engine is difficult to start or does not start at all
Jerking when driving: Unsteady engine running and jerky acceleration
Warning lights: Check engine light and possibly transmission warning light illuminate
Communication error: OBD scanner cannot reach all control units

How can the problem with error code P1701 be rectified?

The repair requires a systematic diagnosis, as various components may be affected.
Check and replace defective fuses in the transmission control circuit and check the power supply
Cleaning or replacing corroded plug connections between the engine control unit and transmission control module
Repair or replacement of damaged cable connections in the CAN bus system
Software update or reprogramming of the engine control unit at the authorized dealer
Replacement of the defective transmission control module after professional diagnosis
Complete system diagnostics with professional OBD scanner to identify the exact source of the fault

FAQ - Frequently asked questions about DTC P1701

Can I continue driving with error code P1701?

Short journeys are possible, but the vehicle should be taken to the workshop as soon as possible. The fault code can lead to unpredictable shifting problems that endanger road safety.

How much does it cost to repair fault code P1701?

The costs vary depending on the cause: fuses and plug connections cost 50-150 euros, software updates 100-200 euros, a new transmission control module can cost 800-1500 euros.

Is error code P1701 a common problem?

This EOBD code occurs relatively frequently in Ford vehicles, especially older models. Regular maintenance can reduce the risk.

Can I repair fault code P1701 myself?

Simple checks such as fuses and plug connections are possible, but most repairs require professional diagnosis and specialized equipment.

Does the code P1701 disappear by itself?

No, this DTC does not disappear automatically. The problem must be rectified and the fault memory cleared.

What tools do I need to diagnose P1701?

An OBD scanner, multimeter and ideally a professional diagnostic device for manufacturer-specific codes are required.

Vehicles in which fault code P1701 occurs most frequently

Fault code P1701 is a manufacturer-specific trouble code and can cause communication problems between the engine and transmission control unit, but is most common in the following vehicles:

Ford: Focus, Fiesta, Mondeo, Escort, Taurus (1995-2010)
Lincoln: Town Car, Continental, Navigator (1998-2006)
Mercury: Grand Marquis, Sable, Mountaineer (1996-2009)
Mazda: Tribute, B-Series (in cooperation with Ford, 2001-2008)

If the code P1701 occurs in your vehicle, you should first check the plug connections and fuses before replacing more expensive components. A professional diagnosis with an EOBD scanner can help to identify the exact cause and avoid unnecessary repair costs. If problems persist, a visit to a specialist workshop is unavoidable, as modern transmission control units are complex electronic systems.

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