P0788 Isuzu Code - 3-2 Shift Solenoid Control Circuit High Voltage
Quick Answer
Shift solenoid valve ST is switched ON OFF by a signal from Engine Control Module (ECM) so that let in or out timing of 2nd brake is adjusted by operating orifice control valve. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty shifting solenoid valve. 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
- P0788 Isuzu indicates 3-2 Shift Solenoid Control Circuit High Voltage.
- Common causes
- Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty shifting solenoid valve.
- 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 P0788 Isuzu Description
What are the Possible Causes of the DTC P0788 Isuzu?
- Low transmission fluid level
- Dirty transmission fluid
- Faulty shifting solenoid valve
- Shifting solenoid valve harness is open or shorted
- Shifting solenoid valve circuit poor electrical connection
How to Fix the DTC P0788 Isuzu?
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 P0788 Isuzu 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 P0788 Isuzu Code
1. What does the OBDII code P0788 mean for an Isuzu vehicle?
The P0788 code indicates a problem with the 3-2 shift solenoid control circuit, specifically that the voltage is higher than expected.
2. What are the common symptoms of code P0788 in an Isuzu?
Symptoms may include harsh or delayed shifting, the transmission being stuck in one gear, reduced fuel efficiency, and the check engine light being illuminated.
3. What causes the P0788 code to appear in an Isuzu?
Potential causes include a faulty 3-2 shift solenoid, damaged wiring or connectors in the solenoid circuit, a short to voltage, or a problem within the transmission control module (TCM).
4. Can driving with code P0788 damage my Isuzu's transmission?
Yes, continuing to drive with this code can cause further damage to the transmission, as improper gear shifting can lead to increased wear on components.
5. How do I diagnose the P0788 code in my Isuzu?
Diagnosis may involve checking the shift solenoid for proper operation, inspecting the wiring and connectors for damage, and testing the TCM for faults.
6. Can a bad battery or alternator trigger the P0788 code?
While unlikely, electrical issues such as a weak battery or faulty alternator could cause voltage irregularities that might contribute to this code.
7. How is the P0788 code fixed in an Isuzu?
Repairs may include replacing the 3-2 shift solenoid, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the TCM.
8. How much does it cost to fix the P0788 code in an Isuzu?
Repair costs depend on the specific issue but can range from $150 to $400 for a solenoid replacement and up to $1,000 if the TCM needs replacement.
9. Can I reset the P0788 code without fixing the issue?
You can clear the code with an OBDII scanner, but if the underlying problem isn't resolved, the code will likely return.
10. How do I prevent the P0788 code from occurring in the future?
Regular transmission maintenance, such as fluid changes, and inspecting wiring and connectors for wear or damage can help prevent this issue.
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