P1843 Pontiac Code - 1-2 Shift Solenoid Circuit High Input Voltage
Quick Answer
With the engine runtime over 5 seconds, system voltage from 8-18v, Fuel Cutoff inactive, 1-2 Shift Solenoid commanded on by the Powertrain Control Module (PCM), the PCM detects a continuous short to power on the 1-2 Shift Solenoid feedback circuit for 4.3 seconds. Common causes include Faulty 1-2 Shift Solenoid, 1-2 Shift Solenoid harness is open or shorted, 1-2 Shift Solenoid circuit poor electrical connection. 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
- P1843 Pontiac indicates 1-2 Shift Solenoid Circuit High Input Voltage.
- Common causes
- Common causes include Faulty 1-2 Shift Solenoid, 1-2 Shift Solenoid harness is open or shorted, 1-2 Shift Solenoid circuit poor electrical connection.
- 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 P1843 Pontiac Description
What are the Possible Causes of the DTC P1843 Pontiac?
- Faulty 1-2 Shift Solenoid
- 1-2 Shift Solenoid harness is open or shorted
- 1-2 Shift Solenoid circuit poor electrical connection
How to Fix the DTC P1843 Pontiac?
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 P1843 Pontiac 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 P1843 Pontiac Code
1. What does the OBDII code P1843 mean for a Pontiac?
The P1843 code indicates a high input voltage in the 1-2 shift solenoid circuit, which is responsible for controlling gear shifts between first and second gear.
2. What are the common symptoms of code P1843 in a Pontiac?
Symptoms may include harsh shifting, failure to shift between first and second gear, the transmission stuck in one gear, and the check engine light being illuminated.
3. What causes the P1843 code to appear in a Pontiac?
Common causes include a faulty 1-2 shift solenoid, damaged wiring or connectors in the solenoid circuit, a malfunctioning transmission control module (TCM), or low transmission fluid.
4. Can I drive my Pontiac with the P1843 code?
Driving with this code can cause transmission damage over time. It’s recommended to address the issue promptly to avoid further complications.
5. How do I diagnose the P1843 code on my Pontiac?
Diagnosis involves checking the 1-2 shift solenoid, inspecting the wiring and connectors for damage, and testing the transmission control module for faults.
6. How do I fix the P1843 code in my Pontiac?
Repairs may include replacing the 1-2 shift solenoid, repairing or replacing damaged wiring or connectors, topping off or replacing transmission fluid, or reprogramming or replacing the TCM.
7. Is the P1843 code specific to Pontiacs?
No, the P1843 code can appear in other vehicles with similar transmission systems, but the repair steps and symptoms may vary slightly by make and model.
8. How much does it cost to fix the P1843 code on a Pontiac?
The cost depends on the root cause. Replacing a shift solenoid typically costs $150–$400, while addressing wiring issues or TCM repairs could vary widely.
9. Can low transmission fluid cause the P1843 code?
Yes, low or contaminated transmission fluid can lead to improper solenoid operation and trigger the P1843 code.
10. Will resetting the code clear the issue?
Resetting the code without fixing the underlying problem will not resolve the issue, and the code is likely to return. Proper diagnosis and repair are necessary.
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