P073E on Mercedes-Benz
Unable to Engage Reverse
P073E on Mercedes-Benz vehicles indicates unable to engage reverse. Au7o has documented this code across 3 Mercedes-Benz models — most commonly on A-Class, B-Class, GLB. This powertrain code indicates the transmission was unable to engage reverse gear when commanded by the transmission computer. It is part of the gear-engagement fault family on modern automatic transmissions. The computer detected that reverse did not engage as requested, suggesting a hydraulic, electrical, or internal mechanical issue. The vehicle may lose reverse function or enter limp mode, so it should be diagnosed promptly to avoid further damage. Typical repair costs on Mercedes-Benz range from $150 to $3,500, depending on the specific model and root cause.
Common Causes of P073E
- •Faulty shift solenoid
- •Valve body fault or stuck valve
- •Low or contaminated transmission fluid
- •Worn reverse clutch/internal mechanical fault
- •Wiring or connector fault in the transmission circuit
- •Faulty transmission control module
P073E on Mercedes-Benz by Model
Mercedes-Benz A-Class(1 issue)
- DCT Transmission Shudder2019-2023
The 8G-DCT dual-clutch transmission develops a shudder during low-speed acceleration, similar to driving over rumble strips. The clutch packs overheat in stop-and-go traffic, causing judder and vibration during engagement.
Mercedes-Benz B-Class(1 issue)
- Dual-Clutch Transmission (DCT) Shudder at Low Speeds2013-2019
The 7-speed dual-clutch transmission (7G-DCT) in the B-Class develops a noticeable shudder during low-speed maneuvers and from a standstill. The issue stems from clutch pack wear and adaptive software that struggles to compensate as the clutch material thins over time.
Mercedes-Benz GLB(1 issue)
- 8G-DCT Transmission Shudder2020-2025
The 8G-DCT dual-clutch transmission exhibits shudder and hesitation during low-speed maneuvers and from a standstill. While improved over the earlier 7G-DCT, the 8G-DCT still uses a wet clutch design that can judder when the clutch packs wear or the software calibration is outdated.
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View P073E across all makes →Frequently Asked Questions
What does P073E mean on Mercedes-Benz?▼
P073E stands for "Unable to Engage Reverse." This powertrain code indicates the transmission was unable to engage reverse gear when commanded by the transmission computer. It is part of the gear-engagement fault family on modern automatic transmissions. The computer detected that reverse did not engage as requested, suggesting a hydraulic, electrical, or internal mechanical issue. The vehicle may lose reverse function or enter limp mode, so it should be diagnosed promptly to avoid further damage. On Mercedes-Benz specifically, this code is documented across 3 models.
What causes P073E on Mercedes-Benz vehicles?▼
Common causes on Mercedes-Benz: Faulty shift solenoid, Valve body fault or stuck valve, Low or contaminated transmission fluid, Worn reverse clutch/internal mechanical fault, Wiring or connector fault in the transmission circuit. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P073E on a Mercedes-Benz?▼
Repair costs on Mercedes-Benz range from $150 to $3,500, depending on the specific model and root cause.
Which Mercedes-Benz models have P073E documented?▼
Au7o has documented P073E on 3 Mercedes-Benz models: A-Class, B-Class, GLB.