P1790 RAM Code - Fault Immediately After Shift
Quick Answer
The P1790 diagnostic trouble code (DTC) refers to a fault that occurs immediately after a shift in the vehicle's transmission. Common causes include Faulty transmission control module (TCM), Low transmission fluid level or poor quality fluid, Malfunctioning shift solenoids. 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 RAM indicates Fault Immediately After Shift.
- Common causes
- Common causes include Faulty transmission control module (TCM), Low transmission fluid level or poor quality fluid, Malfunctioning shift solenoids.
- 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.
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Code P1790 RAM Description
The P1790 diagnostic trouble code (DTC) refers to a fault that occurs immediately after a shift in the vehicle's transmission. This code is specific to vehicles with automatic transmissions. When this code is triggered, it indicates that there is an issue with the transmission control module (TCM) or the transmission itself. The TCM is responsible for controlling the shifting of gears in an automatic transmission based on various inputs such as vehicle speed, engine load, and throttle position.
Common Causes of P1790 RAM
- Faulty transmission control module (TCM)
- Low transmission fluid level or poor quality fluid
- Malfunctioning shift solenoids
- Wiring or electrical issues in the transmission system
- Mechanical issues within the transmission itself
Symptoms of P1790 RAM
- Harsh or erratic shifting
- Slipping gears
- Delayed engagement when shifting
- Transmission overheating
- Illumination of the Check Engine Light
How to Fix P1790 RAM
- Begin by checking the transmission fluid level and quality. Top off or replace the fluid if necessary.
- Inspect the wiring and electrical connections related to the transmission system for any damage or corrosion. Repair or replace as needed.
- Test the shift solenoids to ensure they are functioning correctly. Replace any faulty solenoids.
- If the issue persists, have the TCM scanned for fault codes and reprogrammed if necessary.
- If none of the above steps resolve the issue, a more in-depth inspection of the transmission may be required, potentially leading to repairs such as replacing worn clutches or seals.
Cost to Fix P1790 RAM
The cost of repairing a P1790 fault can vary depending on the specific cause of the issue. In general, the cost of parts for this repair can range from $200 to $800, with labor costs adding an additional $200 to $500. However, it's important to note that labor rates at auto repair shops can vary widely, with hourly rates typically falling between $80 and $150. Additionally, the cost of parts can vary based on the make and model of the vehicle. It's recommended to obtain quotes from multiple repair shops to get a more accurate estimate for your specific situation.
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Frequently Asked Questions about P1790 RAM Code
1. What does the OBDII code P1790 mean on a RAM vehicle?
P1790 indicates a "Fault Immediately After Shift," meaning the transmission control module (TCM) detected an issue following a gear shift.
2. What are the common symptoms of code P1790 in a RAM?
Symptoms may include harsh or delayed shifting, the transmission slipping, erratic gear changes, or the check engine light illuminating.
3. What causes the P1790 code to trigger?
Potential causes include a faulty transmission control module (TCM), damaged wiring or connectors, low or dirty transmission fluid, or a mechanical issue within the transmission.
4. Can driving with code P1790 damage my RAM’s transmission?
Yes, ignoring the issue could lead to further transmission damage or unsafe driving conditions. It's best to address the problem promptly.
5. How is the P1790 code diagnosed?
A technician will use a scan tool to read the code, check the freeze frame data, inspect transmission fluid quality, and perform visual and electrical tests on transmission components.
6. Does low transmission fluid cause code P1790?
Yes, insufficient or contaminated transmission fluid can contribute to shifting issues and trigger the P1790 code.
7. Can a failing TCM cause P1790 to appear?
Yes, a malfunctioning transmission control module can fail to properly control shifts, leading to this fault code.
8. How do you fix the P1790 code on a RAM?
Repairs may involve replacing or reprogramming the TCM, repairing wiring or connectors, flushing and refilling transmission fluid, or addressing internal transmission issues.
9. Is a software update needed to fix code P1790?
In some cases, outdated TCM software can cause shifting faults. A software update may resolve the issue if no mechanical problems are found.
10. How much does it cost to repair the P1790 code on a RAM?
Costs vary depending on the root cause, but repairs may range from $100 for a fluid flush to $1,000+ for TCM replacement or significant transmission repairs.
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