P0849 Mercedes-Benz Code - Transmission Fluid Pressure Sensor/Switch 'B' Circuit Intermittent
Quick Answer
The Transmission Control Module (TCM) monitors the Transmission Fluid Pressure Sensor/Switch signal. Common causes include Faulty Transmission Fluid Pressure Sensor/Switch 'B', Transmission Fluid Pressure Sensor/Switch 'B' harness is open or shorted, Transmission Fluid Pressure Sensor/Switch 'B' circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0849 Mercedes-Benz indicates Transmission Fluid Pressure Sensor/Switch 'B' Circuit Intermittent.
- Common causes
- Common causes include Faulty Transmission Fluid Pressure Sensor/Switch 'B', Transmission Fluid Pressure Sensor/Switch 'B' harness is open or shorted, Transmission Fluid Pressure Sensor/Switch 'B' circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0849 Mercedes-Benz Description
What are the Possible Causes of the DTC P0849 Mercedes-Benz?
- Faulty Transmission Fluid Pressure Sensor/Switch 'B'
- Transmission Fluid Pressure Sensor/Switch 'B' harness is open or shorted
- Transmission Fluid Pressure Sensor/Switch 'B' circuit poor electrical connection
How to Fix the DTC P0849 Mercedes-Benz?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0849 Mercedes-Benz code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0849 Mercedes-Benz Code
1. What does the OBDII code P0849 mean for a Mercedes-Benz?
Code P0849 indicates an intermittent issue with the Transmission Fluid Pressure Sensor/Switch 'B' circuit, which monitors fluid pressure in the transmission to ensure proper shifting.
2. What are the common symptoms of a P0849 code on a Mercedes-Benz?
Symptoms may include delayed or harsh shifting, transmission slipping, the vehicle going into limp mode, and the check engine light being illuminated.
3. What causes the P0849 code to appear on a Mercedes-Benz?
Common causes include a faulty transmission fluid pressure sensor/switch, damaged wiring or connectors, low or dirty transmission fluid, or an issue with the transmission control module (TCM).
4. Can low transmission fluid cause a P0849 code?
Yes, low or dirty transmission fluid can lead to incorrect pressure readings, triggering the P0849 code.
5. How can I diagnose a P0849 code on my Mercedes-Benz?
Diagnosis involves checking transmission fluid levels and condition, inspecting the wiring and connectors for damage or corrosion, and testing the transmission fluid pressure sensor/switch for proper function.
6. Is it safe to drive a Mercedes-Benz with a P0849 code?
Driving with a P0849 code is not recommended, as it can lead to further transmission damage or unsafe driving conditions if shifting issues worsen.
7. How do I fix a P0849 code on my Mercedes-Benz?
Repairs may involve replacing the transmission fluid pressure sensor/switch, repairing damaged wiring, cleaning connectors, or servicing the transmission fluid and filter.
8. How much does it cost to repair a P0849 code on a Mercedes-Benz?
Repair costs vary, but sensor replacement typically ranges from $150 to $400, while wiring repairs or transmission service may add additional costs.
9. Can a P0849 code clear itself after repairs?
If the underlying issue is resolved, the code may clear itself after multiple drive cycles, but it’s recommended to use an OBDII scanner to clear the code and confirm the repair.
10. Could a faulty TCM cause the P0849 code on a Mercedes-Benz?
Yes, a malfunctioning Transmission Control Module can cause intermittent circuit issues and trigger the P0849 code, though this is less common than sensor or wiring problems.
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