P0702 on 2005-2013 Jeep Grand Cherokee — Transmission Control System Electrical
1 vehicles · 1 makes · $300-$3,500 repair
How to diagnose and fix P0702: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Jeep Grand Cherokee · 2005–2013
The Mercedes-derived W5A580 (NAG1) 5-speed automatic used in WK and early WK2 Grand Cherokees is mechanically strong but suffers well-documented electronic and fluid-related failures. Faulty conductor-plate speed sensors and shift-pressure solenoids drop the transmission into limp mode (stuck in a single gear). Contaminated or degraded fluid (including water intrusion past the dipstick/fill-tube seal) causes torque-converter-clutch shudder, harsh or delayed shifts, and a knock on coasting downshifts. The 13-pin connector adapter can also leak, wicking fluid into the harness by capillary action.
Common Symptoms
- Transmission stuck in one gear (limp mode)
- Harsh, delayed, or banging shifts
- Shudder/buzz during light acceleration (TCC)
- Knock when coasting/downshifting
- Transmission warning or P0700-family codes
- Fluid leak at electrical connector
How to Fix
Scan for transmission codes; for limp mode inspect/replace the conductor plate (with integrated speed sensors) and any failed shift solenoid, and replace the 13-pin connector adapter/seal if leaking. Perform a full fluid-and-filter service with the correct ATF (MB 236.x / Mopar spec). Address water intrusion at the fill tube. Severe internal damage from prolonged shudder may require a rebuild.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Dorman 917-678 NAG1 conductor plate kitOEMDorman 917-678 / Mopar 52108308AC
Conductor-plate replacement after N2/N3 sensor or plate-circuit diagnosis on a confirmed NAG1 Fitment/availability: Dorman cross-references Chrysler 52108308AC and 68021352AA. Confirm the installed W5A580/NAG1 and sales code; Dorman 917-…
- OEM Mercedes 2035400253 NAG1 13-pin connector adapter with O-ringsOEMMercedes 2035400253
Case-connector sleeve replacement when leakage/fluid wicking is confirmed or the sleeve is disturbed Fitment/availability: Exact 722.6/NAG1 13-pin adapter. Confirm the installed transmission and connector; inspect the harness and TCM for…
- Genuine Mopar 52108325AA NAG1 transmission filterOEMMopar 52108325AA
Internal sump-filter replacement during a properly scoped NAG1 pan service Fitment/availability: The catalog includes specified 2005-2013 Grand Cherokee applications but also combinations using other transmissions; confirm the NAG1 tag/V…
- Crown 52108332AA NAG1 transmission pan gasketOEMCrown 52108332AA
Replacement pan gasket during a confirmed NAG1 service Fitment/availability: Crown 52108332AA is cataloged for specified 2006-2013 Grand Cherokee W5A580/NAG1 applications. Confirm the installed transmission and inspect the pan before ord…
- Genuine Mopar ATF+4 68218057AC one-quart fluidOEMMopar 68218057AC
Conditional fluid for a confirmed U.S.-specification NAG1/DGJ service that calls for MS-9602 ATF+4 Fitment/availability: Mopar 68218057AC, one quart. Verify the installed transmission, market and service specification before filling; do …
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (2)
Find P0702 by make
Browse every documented model and issue for your make.
P0702 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 P0702 mean?
P0702 stands for "Transmission Control System Electrical." Indicates the PCM/TCM has detected an electrical fault (open, short, or out-of-range voltage) within the transmission control system circuitry rather than a performance issue. Points to wiring, connectors, or the control module itself.
What are the most common causes of P0702?
The most common causes of P0702 are: Open or shorted wiring in the transmission control circuit, Corroded or loose connectors, Faulty transmission control module, Failed transmission solenoid pack or internal harness, Damaged ground circuit. The specific cause varies by vehicle.
How much does it cost to fix P0702?
Repair costs for P0702 range from $300 to $3,500, depending on the vehicle and root cause.
Which vehicles are affected by P0702?
Au7o has documented P0702 across 1 vehicle models from 1 manufacturers: Jeep.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.