P0731 Jeep Code - Gear Ratio Error In First Gear
Quick Answer
This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows: Torque converter slip ratio = A x C/B A: Output shaft revolution signal from revolution sensor B: Engine speed signal from Engine Control Module (ECM) C: Gear ratio determined as gear position which TCM supposes If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than normal. Common causes include Low transmission fluid level, Dirty transmission fluid, 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
- P0731 Jeep indicates Gear Ratio Error In First Gear.
- Common causes
- Common causes include Low transmission fluid level, Dirty transmission fluid, 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.
Code P0731 Jeep Description
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from Engine Control Module (ECM)
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.
What are the Possible Causes of the DTC P0731 Jeep?
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit
How to Fix the DTC P0731 Jeep?
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.
Code Tech Notes
There is a Factory Service Bulletin for the Jeep following models:
2005-2006 Jeep Liberty
2005-2006 Jeep Cherokee
2005-2006 Jeep Grand Cherokee
2006 Jeep Commander
Jeep Factory Service Bulletin OBDII Code P0731
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0731 Jeep 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 P0731 Jeep Code
What does OBD-II code P0731 mean for a Jeep?
P0731 indicates a "Gear Ratio Error in First Gear," meaning the transmission is unable to achieve the expected gear ratio for first gear.
What are common symptoms of code P0731 in a Jeep?
Symptoms include slipping in first gear, delayed shifting, poor acceleration, and the Check Engine Light being illuminated.
What causes the P0731 code in a Jeep?
Possible causes include low transmission fluid, a malfunctioning transmission solenoid, worn clutch plates, damaged gears, or a faulty transmission control module.
Can driving with a P0731 code damage my Jeep?
Yes, driving with this code can cause further damage to the transmission and result in costly repairs if not addressed promptly.
How can I diagnose the P0731 code on my Jeep?
Diagnosing involves checking the transmission fluid level, inspecting wiring and connectors, testing solenoids, and using a scan tool to monitor transmission operation.
Is low transmission fluid a common cause of the P0731 code?
Yes, low or dirty transmission fluid can prevent proper hydraulic pressure, leading to a gear ratio error in first gear.
How do I fix the P0731 code on my Jeep?
Repairs may involve refilling or replacing the transmission fluid, repairing damaged wiring, replacing solenoids, or rebuilding the transmission if internal damage is present.
Can a faulty transmission solenoid trigger the P0731 code?
Yes, a malfunctioning solenoid can prevent the transmission from engaging first gear properly, causing the gear ratio error.
Does the P0731 code mean I need a transmission rebuild?
Not always; minor issues like fluid or solenoid problems can sometimes be fixed without a full rebuild, but severe internal damage may require one.
How much does it cost to repair the P0731 code on a Jeep?
Costs vary depending on the cause, ranging from $100 for fluid changes to several thousand dollars for a transmission rebuild.
Discuss the causes and fixes for P0731 Jeep OBDII Code
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2004 grand Cherokee suddenly stopped moving while traveling at 60 mph. forward or reverse are no engaging getting code p0731 p0841 and p0876
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I recommend start by checking the transmission fluid level and condition. What is the engine size of your 2004 GC?
P0841 JEEP - LR Pressure Switch Rationality Fault
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