P0844 Mercedes-Benz Code - Transmission Fluid Pressure Sensor/Switch 'A' 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 'A', Transmission Fluid Pressure Sensor/Switch 'A' harness is open or shorted, Transmission Fluid Pressure Sensor/Switch 'A' 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
- P0844 Mercedes-Benz indicates Transmission Fluid Pressure Sensor/Switch 'A' Circuit Intermittent.
- Common causes
- Common causes include Faulty Transmission Fluid Pressure Sensor/Switch 'A', Transmission Fluid Pressure Sensor/Switch 'A' harness is open or shorted, Transmission Fluid Pressure Sensor/Switch 'A' 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 P0844 Mercedes-Benz Description
What are the Possible Causes of the DTC P0844 Mercedes-Benz?
- Faulty Transmission Fluid Pressure Sensor/Switch 'A'
- Transmission Fluid Pressure Sensor/Switch 'A' harness is open or shorted
- Transmission Fluid Pressure Sensor/Switch 'A' circuit poor electrical connection
How to Fix the DTC P0844 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 P0844 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 P0844 Mercedes-Benz Code
1. What does the OBDII code P0844 mean on a Mercedes-Benz?
P0844 indicates an intermittent issue with the Transmission Fluid Pressure Sensor/Switch 'A' circuit, which monitors hydraulic pressure in the transmission.
2. What are common symptoms of the P0844 code in a Mercedes-Benz?
Symptoms may include erratic shifting, the transmission staying in limp mode, delayed engagement, or the illumination of the check engine light.
3. What causes the P0844 code to appear in a Mercedes-Benz?
Possible causes include a faulty transmission fluid pressure sensor, damaged or corroded wiring, a loose electrical connection, or low or dirty transmission fluid.
4. Can low transmission fluid trigger the P0844 code in a Mercedes-Benz?
Yes, low or contaminated transmission fluid can cause incorrect pressure readings, leading to the P0844 code.
5. Is it safe to drive a Mercedes-Benz with the P0844 code active?
Driving with this code is not recommended, as it can lead to transmission damage or unsafe driving conditions due to shifting issues.
6. How do I diagnose the P0844 code on my Mercedes-Benz?
Start by checking the transmission fluid level and condition, inspecting the wiring and connectors for damage, and testing the transmission fluid pressure sensor for proper operation.
7. How much does it cost to fix the P0844 code on a Mercedes-Benz?
Repair costs can range from $150 to $500, depending on whether the issue is with the sensor, wiring, or fluid. Labor and diagnostic fees may vary.
8. Can a faulty transmission control module (TCM) cause the P0844 code in a Mercedes-Benz?
Yes, a malfunctioning TCM can lead to intermittent issues with the pressure sensor circuit, triggering the P0844 code.
9. How can I prevent the P0844 code from reoccurring in my Mercedes-Benz?
Regularly maintain the transmission fluid, inspect wiring for wear or damage, and replace components as needed to prevent electrical or hydraulic issues.
10. Do I need to reprogram the TCM after fixing the P0844 code on a Mercedes-Benz?
In some cases, reprogramming or resetting the TCM may be necessary to clear the code and ensure proper functionality after repairs.
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