P1477 BMW Code - Leakage Diagnostic Pump Reed Switch Did Not Open
Quick Answer
P1477 BMW indicates Leakage Diagnostic Pump Reed Switch Did Not Open. Common causes include Faulty Leakage Diagnostic Pump Reed Switch, Leakage Diagnostic Pump Reed Switch harness is open or shorted, Leakage Diagnostic Pump Reed 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
- P1477 BMW indicates Leakage Diagnostic Pump Reed Switch Did Not Open.
- Common causes
- Common causes include Faulty Leakage Diagnostic Pump Reed Switch, Leakage Diagnostic Pump Reed Switch harness is open or shorted, Leakage Diagnostic Pump Reed 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 P1477 BMW Description
What are the Possible Causes of the DTC P1477 BMW?
- Faulty Leakage Diagnostic Pump Reed Switch
- Leakage Diagnostic Pump Reed Switch harness is open or shorted
- Leakage Diagnostic Pump Reed Switch circuit poor electrical connection
How to Fix the DTC P1477 BMW?
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 P1477 BMW 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 P1477 BMW Code
1. What does the OBDII code P1477 mean on a BMW?
P1477 indicates that the Leakage Diagnostic Pump (LDP) reed switch did not open, suggesting a potential issue in the evaporative emissions control system.
2. What are the common symptoms of code P1477 on a BMW?
Symptoms may include the check engine light turning on, a possible fuel odor, and, in some cases, reduced fuel efficiency or difficulty passing emissions tests.
3. What causes the P1477 code to appear on a BMW?
Common causes include a faulty leakage diagnostic pump, a stuck or damaged reed switch, wiring issues, or a problem with the EVAP system, such as a leak.
4. Can a loose gas cap trigger the P1477 code on a BMW?
While a loose gas cap is a common cause of EVAP-related codes, it is less likely to cause P1477 specifically. However, it’s worth checking the gas cap as part of the diagnostic process.
5. How do I diagnose the P1477 code on my BMW?
Start by inspecting the Leakage Diagnostic Pump and its reed switch for damage. Check the wiring and connectors for corrosion or disconnections, and use a smoke machine to test for EVAP leaks if necessary.
6. Can I drive my BMW with the P1477 code?
Yes, you can drive with the P1477 code, but it’s best to address the issue promptly to avoid potential EVAP system damage or failing an emissions test.
7. How do I fix the P1477 code on a BMW?
Repairs may involve replacing the Leakage Diagnostic Pump, repairing wiring or connectors, or addressing any leaks in the EVAP system.
8. How much does it cost to fix the P1477 code on a BMW?
The repair cost can vary but typically ranges from $150 to $500, depending on whether the issue is with the pump, wiring, or other EVAP components.
9. Can a faulty reed switch alone cause the P1477 code?
Yes, a malfunctioning reed switch in the Leakage Diagnostic Pump can directly cause the P1477 code by failing to open as expected.
10. Will clearing the P1477 code with a scanner fix the problem?
Clearing the code may turn off the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.
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