P0463 Cadillac Code - Fuel Level Sensor Circuit High Voltage
Quick Answer
The primary fuel level sensor and the secondary fuel level sensor change resistance based on fuel level. Common causes include Faulty Fuel Level Sensor, Fuel Level Sensor harness is open or shorted, Fuel Level Sensor 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
- P0463 Cadillac indicates Fuel Level Sensor Circuit High Voltage.
- Common causes
- Common causes include Faulty Fuel Level Sensor, Fuel Level Sensor harness is open or shorted, Fuel Level Sensor 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 P0463 Cadillac Description
The Diagnostic Trouble Code (DTC) will be set if the ECM detects the signal voltage is greater than 4.7 V.
What are the Possible Causes of the DTC P0463 Cadillac?
- Faulty Fuel Level Sensor
- Fuel Level Sensor harness is open or shorted
- Fuel Level Sensor circuit poor electrical connection
- Faulty Instrument Cluster
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0463 Cadillac?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0463 Cadillac 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 P0463 Cadillac Code
No Frequently Asked Questions about P0463 Cadillac Code found.
Discuss the causes and fixes for P0463 Cadillac OBDII Code
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This is a very common problem on late-1990's early 2000's Cadillacs. I did a lot of research and the problem is usually sulfur fouling of the fuel level sensing element in the fuel tank. Turns out that a lot of gasoline around that time frame in the Northeast had too much sulfur content and it fouled many things including these elements. It causes the fuel level gauge to appear full all of the time. The only solutions are:
• to fill the car when driven an arbitrary distance (250 - 300 miles seems popular)
• to fill the car when driven an arbitrary number of days (once a week works for me)
• to replace the fuel pump / filter / level sensor assembly ($500 to $1,000 estimated)
• to use the digital "fuel used" readout (if one has the digital dash option like my '04 DeVille)
• add a bottle of Chevron 65740 Techron Concentrate Plus Fuel System Cleaner each fillup
(Some chemical in Techron cleans the fuel level sensor element and allows it to work but it is
very expensive -- $15 a bottle -- and takes a while to work. I had to quit after four bottles due
to budgetary issues but by now the top quarter of the fuel level gauge actually works.)
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