P1790 Dodge Code - Fault Immediately After Shift
Quick Answer
This Diagnostic Trouble Code (DTC) is set if the engine is running and the vehicle speed is more than 10 mph in Drive, and the Transmission Control Module (TCM) detects a Speed Ratio Code within 1.3 seconds after a shift event occurs. Common causes include Transmission has an internal mechanical problem. 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
- P1790 Dodge indicates Fault Immediately After Shift.
- Common causes
- Common causes include Transmission has an internal mechanical problem.
- 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 P1790 Dodge Description
What are the Possible Causes of the DTC P1790 Dodge?
- Transmission has an internal mechanical problem
How to Fix the DTC P1790 Dodge?
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 P1790 Dodge 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 P1790 Dodge Code
1. What does OBDII code P1790 mean on a Dodge vehicle?
P1790 indicates a "Fault Immediately After Shift," meaning the transmission control module (TCM) detected an issue right after a gear shift.
2. What are the common symptoms of P1790 on a Dodge?
Symptoms may include harsh or erratic shifting, transmission slipping, the vehicle going into limp mode, and the check engine light turning on.
3. What causes the P1790 code to trigger?
Common causes include a faulty transmission control module (TCM), issues with the input or output speed sensors, a failing valve body, or low transmission fluid.
4. Can a low transmission fluid level cause the P1790 code?
Yes, low or degraded transmission fluid can affect proper shifting and trigger the P1790 code.
5. How do I diagnose the P1790 code on my Dodge?
Start by checking the transmission fluid level and condition. Then, use an OBDII scanner to check for related codes and inspect the input/output speed sensors, wiring, and TCM functionality.
6. Is it safe to drive with the P1790 code active?
Driving with the P1790 code is not recommended, as it can lead to further damage to the transmission and affect vehicle performance.
7. What repairs are commonly needed to fix the P1790 code?
Repairs may include replacing the input or output speed sensors, repairing wiring or connectors, servicing the valve body, or reprogramming/replacing the TCM.
8. Can clearing the P1790 code fix the problem?
Clearing the code will remove it temporarily, but if the underlying issue is not resolved, the code will likely return.
9. How much does it cost to fix the P1790 code on a Dodge?
Repair costs vary depending on the cause but typically range from $100 for sensor replacements to over $1,000 for major transmission repairs.
10. Can a bad speed sensor trigger the P1790 code?
Yes, a malfunctioning input or output speed sensor can cause incorrect transmission data, leading to the P1790 code.
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