P1702 on 2003-2016 Citroen C3 — Transmission Range Sensor Circuit Intermittent (Ford)
1 vehicles · 1 makes · $600-$3,000 repair
How to diagnose and fix P1702: most-reported vehicles
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Citroen C3 · 2003–2016
C3s fitted with Citroen's automated-manual gearboxes — SensoDrive on the C3 I, then EGS6/ETG6 on later e-HDi and PureTech cars — suffer well-documented failures of the electronic clutch actuator, gear actuator and gearbox ECU. Worn actuator motors and clutch-position adaptation errors cause violently jerky gearchanges, refusal to select gears, gearbox warning messages with the box locked in gear (limp mode), and in some ECU failures a car that will not start. Specialist rebuilders describe the actuator and ECU faults as inherent design weaknesses, and repairs at a dealer can run from several hundred to several thousand pounds.
Common Symptoms
- Jerky or violent gearchanges
- Gearbox warning light or message, stuck in one gear (limp mode)
- Refusal to select gears from neutral
- Engine will not start (gearbox ECU fault)
- Juddering when pulling away
- Delayed engagement of drive or reverse
How to Fix
Have the stored fault codes read by a PSA specialist: failed clutch/gear actuators can be rebuilt or replaced and the clutch self-calibration relearned, while gearbox ECUs can be tested and rebuilt by specialists at far less than dealer replacement cost. A worn clutch must be replaced and the actuator recalibrated at the same time.
Sources for this issue (7)
- Sinspeed — Citroen/Peugeot SensoDrive Clutch & Gear Actuator Repairsarticle
- French Car Forum — SensoDrive gearbox troubleshooting (clutch + actuator most frequent failure)forum
- French Car Forum — Citroen C3 SensoDrive issue (P1755 clutch actuator coherence fault, no-start)forum
- FixMyCar — Citroen C3 Problems: SensoDrive semi-auto is the main trouble spot (2002-2009)article
- ECU Testing — Citroen C2/C3 SensoDrive Gearbox ECU common fault (2003-2011)article
- The Vehicle Check — Citroen SensoDrive Clutch Actuator Fault and Repair (C2/C3 1.1/1.4/1.6)article
- ASR Gearbox Repairs — Citroen C3 Common Gearbox Problems (ETG locked in gear, harsh shifts)article
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P1702 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P1702 mean?
P1702 stands for "Transmission Range Sensor Circuit Intermittent (Ford)." P1702 is a manufacturer-specific code. On Ford, Lincoln, and Mazda vehicles (the dominant usage, shared by Citroën/Peugeot), it means the computer is intermittently losing or receiving an implausible signal from the transmission range (TR) sensor — the switch that tells the PCM/TCM whether you have selected Park, Reverse, Neutral, or Drive. When the signal drops out you may see a blank or wrong PRNDL display, harsh or erratic shifting, no reverse lights, or an engine that won't crank in Park; on 2011-2017 Ford trucks with the 6R80 transmission the sensor is part of an internal "lead frame" harness with a well-documented failure pattern (often with P0705, P0706, or P1921). Ignoring it risks being stranded with a no-start or the transmission engaging a gear the computer didn't expect. Note that the definition differs on other brands: on VW/Audi (VAG code 18110) P1702 instead means the transmission control module could not activate its fail-safe (limp-home) function because another equal-priority fault is stored, and on Nissan/Infiniti it indicates a TCM RAM error — so verify the meaning for your specific make.
What are the most common causes of P1702?
The most common causes of P1702 are: Failed or worn transmission range (TR) sensor — on 2011-2017 Ford 6R80 trucks/SUVs this is the molded lead frame inside the transmission, a known failure point, Corroded or moisture-contaminated TR sensor connector pins causing intermittent signal dropouts, Damaged, chafed, or loose wiring in the TR sensor circuit, Misadjusted shift cable/linkage or TR sensor alignment, On VW/Audi: a second stored transmission fault of equal priority blocking the TCM's fail-safe function (often points to a deeper TCM or transmission fault), Low or contaminated transmission fluid degrading the internal lead-frame sensor, Faulty PCM/TCM (rare). The specific cause varies by vehicle.
How much does it cost to fix P1702?
Repair costs for P1702 range from $600 to $3,000, depending on the vehicle and root cause.
Which vehicles are affected by P1702?
Au7o has documented P1702 across 1 vehicle models from 1 manufacturers: Citroen.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.