P0734 2003 Nissan Altima Sedan Code - 4th. Gear Malfunction
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 (4th) 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
- P0734 2003 Nissan Altima Sedan indicates 4th. Gear Malfunction.
- 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 P0734 2003 Nissan Altima Sedan 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 (4th) 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 P0734 2003 Nissan Altima Sedan?
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit
How to Fix the DTC P0734 2003 Nissan Altima Sedan?
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
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0734 2003 Nissan Altima Sedan 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 P0734 2003 Nissan Altima Sedan Code
1. What does the P0734 code mean on a 2003 Nissan Altima?
P0734 indicates a 4th gear ratio malfunction, meaning the transmission is having trouble engaging or maintaining 4th gear.
2. What are the common symptoms of P0734 in a 2003 Nissan Altima?
Symptoms include difficulty shifting into 4th gear, slipping gears, harsh shifting, reduced fuel efficiency, and the Check Engine Light turning on.
3. What causes the P0734 code in a 2003 Nissan Altima?
Common causes include low transmission fluid, a faulty transmission solenoid, worn clutch packs, a damaged valve body, or internal transmission issues.
4. Can low transmission fluid trigger the P0734 code?
Yes, low or contaminated transmission fluid can cause improper hydraulic pressure, leading to a 4th gear malfunction.
5. How do I check the transmission fluid in a 2003 Nissan Altima?
Park the vehicle on a level surface, let the engine warm up, and check the fluid level using the dipstick in the transmission. Ensure the fluid is clean and at the correct level.
6. Is it safe to drive with a P0734 code on a 2003 Nissan Altima?
Driving with this code can cause further damage to the transmission. It’s best to address the issue promptly.
7. How is the P0734 code diagnosed?
A mechanic will check the transmission fluid, inspect the transmission solenoids, test the wiring, and possibly perform a pressure test or scan for additional codes.
8. How much does it cost to fix the P0734 code on a 2003 Nissan Altima?
Repairs can range from $100 for a fluid flush to several thousand dollars if the transmission needs a rebuild or replacement.
9. Can a faulty transmission control module cause the P0734 code?
Yes, a malfunctioning transmission control module (TCM) can send incorrect signals, leading to a 4th gear malfunction.
10. Will resetting the Check Engine Light fix the P0734 code?
Resetting the light won’t fix the underlying problem. The issue causing the code must be addressed to prevent it from reappearing.
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