P0851 Pontiac Code - Park/Neutral Position Switch Circuit Low Voltage
Quick Answer
The transmission manual shift shaft switch assembly, also known as the Internal Mode Switch (IMS), is a sliding contact switch attached to the manual shift shaft inside the transmission case. Common causes include Faulty Park/Neutral Switch, Park/Neutral Switch harness is open or shorted, Park/Neutral Switch 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
- P0851 Pontiac indicates Park/Neutral Position Switch Circuit Low Voltage.
- Common causes
- Common causes include Faulty Park/Neutral Switch, Park/Neutral Switch harness is open or shorted, Park/Neutral Switch 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 P0851 Pontiac Description
What are the Possible Causes of the DTC P0851 Pontiac?
- Faulty Park/Neutral Switch
- Park/Neutral Switch harness is open or shorted
- Park/Neutral Switch circuit poor electrical connection
How to Fix the DTC P0851 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 P0851 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 P0851 Pontiac Code
1. What does the OBDII code P0851 mean for a Pontiac?
P0851 indicates a low voltage issue in the Park/Neutral Position Switch Circuit, which helps the vehicle recognize when it's in park or neutral.
2. What are common symptoms of P0851 in a Pontiac?
Symptoms include difficulty starting the vehicle, improper gear engagement, or the transmission behaving erratically.
3. What causes the P0851 code to appear in a Pontiac?
Common causes include a faulty Park/Neutral position switch, damaged wiring or connectors, or low battery voltage.
4. Can the P0851 code affect my Pontiac’s drivability?
Yes, it can cause issues with shifting gears or prevent the vehicle from starting properly.
5. How do you diagnose the P0851 code in a Pontiac?
Diagnosis involves checking the Park/Neutral position switch, inspecting wiring and connectors for damage, and verifying voltage levels in the circuit.
6. Is it safe to drive a Pontiac with the P0851 code?
It is not recommended, as the code can lead to unpredictable transmission behavior and starting issues.
7. How can you fix the P0851 code in a Pontiac?
Repairs may include replacing the Park/Neutral position switch, repairing damaged wiring, or ensuring proper voltage is supplied to the circuit.
8. Can a low battery cause the P0851 code in a Pontiac?
Yes, insufficient battery voltage can contribute to the low voltage in the Park/Neutral position switch circuit.
9. How much does it typically cost to repair the P0851 code in a Pontiac?
Costs vary, but replacing the Park/Neutral position switch can range from $100 to $300, depending on parts and labor.
10. Can I clear the P0851 code without fixing the issue?
Clearing the code without addressing the underlying problem may cause it to reappear and could lead to further complications.
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