P1823 Chevrolet Code - Internal Mode Switch Circuit 'P' Low
Quick Answer
With the engine runtime over 5 seconds, system voltage from 8-18v, Fuel Cutoff inactive, engine torque from 30-148 ft-lb (40-200 Nm), the Powertrain Control Module (PCM) received an Internal Mode Switch (IMS) signal indicating PARK for 2 seconds, and then the IMS indicated a transitional state between Neutral and D4, conditions met for 5 seconds. Common causes include Faulty Internal Mode Switch, Internal Mode Switch harness is open or shorted, Internal Mode 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
- P1823 Chevrolet indicates Internal Mode Switch Circuit 'P' Low.
- Common causes
- Common causes include Faulty Internal Mode Switch, Internal Mode Switch harness is open or shorted, Internal Mode 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 P1823 Chevrolet Description
What are the Possible Causes of the DTC P1823 Chevrolet?
- Faulty Internal Mode Switch
- Internal Mode Switch harness is open or shorted
- Internal Mode Switch circuit poor electrical connection
How to Fix the DTC P1823 Chevrolet?
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 P1823 Chevrolet 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 P1823 Chevrolet Code
1. What does the OBDII code P1823 mean on a Chevrolet?
P1823 indicates an issue with the Internal Mode Switch (IMS) circuit for the "Park" (P) position, where the circuit is reading a low voltage signal.
2. What are the common symptoms of the P1823 code on a Chevrolet?
Symptoms can include the transmission not shifting properly, the vehicle failing to start in "Park," or the Check Engine Light illuminating.
3. What causes the P1823 code to appear on a Chevrolet?
Common causes include a faulty Internal Mode Switch, damaged wiring or connectors in the IMS circuit, or a malfunctioning transmission control module (TCM).
4. Can I still drive my Chevrolet with the P1823 code active?
It is not recommended, as the transmission may not function correctly, which could lead to further damage or unsafe driving conditions.
5. How do you diagnose the P1823 code on a Chevrolet?
Diagnosis typically involves scanning for additional codes, visually inspecting the wiring and connectors, and testing the voltage and continuity of the IMS circuit.
6. What repairs are needed to fix the P1823 code?
Repairs may include replacing the Internal Mode Switch, repairing or replacing damaged wiring, or reprogramming/replacing the TCM if necessary.
7. How much does it cost to repair a P1823 code on a Chevrolet?
Repair costs can vary widely, ranging from $100 to $500 or more, depending on whether only wiring repairs are needed or if components like the IMS or TCM require replacement.
8. Can a bad battery cause the P1823 code on a Chevrolet?
A weak or failing battery is unlikely to directly cause this code but could potentially contribute to electrical issues that affect the IMS circuit.
9. Is the P1823 code specific to Chevrolet vehicles?
No, while the code may appear in other makes and models, the specific meaning and repair steps can vary by manufacturer.
10. Can clearing the code fix the P1823 issue on a Chevrolet?
Clearing the code might temporarily turn off the Check Engine Light, but if the underlying issue is not resolved, the code will likely return.
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