P073C: Transmission Stuck In Gear 7 / Gear 7 Engagement Fault
3 vehicles · 1 makes · $150-$3,500 repair
Most Reported On
P073C is an OBD-II diagnostic trouble code meaning “Transmission Stuck In Gear 7 / Gear 7 Engagement Fault.” This powertrain code relates to the transmission being unable to properly disengage or commanded gear control, generally indicating it is stuck in 7th gear (or cannot leave gear 7 as commanded). It is part of a family of newer transmission gear-engagement codes used on multi-speed automatics. The transmission computer detected that the actual gear state did not match what it commanded. This can cause harsh operation, limited gear range, or limp mode, and warrants prompt diagnosis to avoid further transmission damage. This code is most commonly reported on 2019-2023 Mercedes-Benz A-Class (A220), 2020-2025 Mercedes-Benz GLB (GLB250), and 2013-2019 Mercedes-Benz B-Class (B250, B250e), with repair costs ranging from $150 to $3,500.
Common Causes
Typical Repair Cost
Based on 3 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P073C, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
FAQ
What does P073C mean?
P073C stands for "Transmission Stuck In Gear 7 / Gear 7 Engagement Fault." This powertrain code relates to the transmission being unable to properly disengage or commanded gear control, generally indicating it is stuck in 7th gear (or cannot leave gear 7 as commanded). It is part of a family of newer transmission gear-engagement codes used on multi-speed automatics. The transmission computer detected that the actual gear state did not match what it commanded. This can cause harsh operation, limited gear range, or limp mode, and warrants prompt diagnosis to avoid further transmission damage.
What are the most common causes of P073C?
The most common causes of P073C are: Faulty shift solenoid or valve body fault, Low or contaminated transmission fluid, Stuck or worn valve body passages, Internal mechanical fault (clutch/clutch pack), Wiring or connector fault in the transmission circuit, Faulty transmission control module. The specific cause varies by vehicle.
How much does it cost to fix P073C?
Repair costs for P073C range from $150 to $3,500, depending on the vehicle and root cause.
Which vehicles are affected by P073C?
Au7o has documented P073C across 3 vehicle models from 1 manufacturers: Mercedes-Benz.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.