P0736 on Mercedes-Benz
Reverse Incorrect Gear Ratio
P0736 on Mercedes-Benz vehicles indicates reverse incorrect gear ratio. Au7o has documented this code across 1 Mercedes-Benz model — most commonly on C-Class. This code means the transmission control module calculated that the actual gear ratio in reverse does not match the expected ratio. The module compares input (turbine) speed to output speed to verify the transmission is in the correct gear; a mismatch in reverse indicates slipping or a hydraulic/mechanical problem in reverse. Symptoms include the vehicle slipping in or refusing to engage reverse. Internal clutch wear, low fluid, or solenoid faults are typical causes. Typical repair costs on Mercedes-Benz range from $600 to $1,800, depending on the specific model and root cause.
Common Causes of P0736
- •Worn reverse clutches/bands (internal slippage)
- •Low or dirty transmission fluid
- •Faulty shift or pressure control solenoid
- •Internal hydraulic pressure loss
- •Valve body fault
- •Faulty speed sensor giving bad ratio data
- •Faulty transmission control module
P0736 on Mercedes-Benz by Model
Mercedes-Benz C-Class(1 issue)
- 722.6 5G-Tronic conductor plate failure (limp mode, stuck in 2nd gear)1996-2002
The 722.6 five-speed automatic (fitted to W202 facelift cars from ~1996 onward and all 2001-2002 W203s) uses an electronic conductor plate mounted on top of the valve body that integrates the speed sensors and routes signals to the solenoids. The plate fails for two reasons: (1) the internal RPM sensors get coated by ferrous wear particles when the fluid is never changed, producing implausible-slip codes, and (2) the soldered traces and embedded capacitor crack from heat cycling. Failure puts the transmission into limp-home mode — stuck in 2nd gear, harsh 1-2 and 2-3 shifts, or no upshift at all. Often accompanied by codes P0717, P0720, P0731-P0736 and a transmission warning light. This is the single most common 722.6 failure across every Mercedes chassis that uses it.
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What does P0736 mean on Mercedes-Benz?▼
P0736 stands for "Reverse Incorrect Gear Ratio." This code means the transmission control module calculated that the actual gear ratio in reverse does not match the expected ratio. The module compares input (turbine) speed to output speed to verify the transmission is in the correct gear; a mismatch in reverse indicates slipping or a hydraulic/mechanical problem in reverse. Symptoms include the vehicle slipping in or refusing to engage reverse. Internal clutch wear, low fluid, or solenoid faults are typical causes. On Mercedes-Benz specifically, this code is documented across 1 model.
What causes P0736 on Mercedes-Benz vehicles?▼
Common causes on Mercedes-Benz: Worn reverse clutches/bands (internal slippage), Low or dirty transmission fluid, Faulty shift or pressure control solenoid, Internal hydraulic pressure loss, Valve body fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0736 on a Mercedes-Benz?▼
Repair costs on Mercedes-Benz range from $600 to $1,800, depending on the specific model and root cause.
Which Mercedes-Benz models have P0736 documented?▼
Au7o has documented P0736 on 1 Mercedes-Benz model: C-Class.