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fuel problem

C5 inaccurate fuel gauge

The C5 has two fuel tanks, each with its own level sender. Owners commonly report a fuel gauge that reads wrong, jumps around or shows empty with fuel in the tanks. The usual cause is worn or contaminated sender contacts.

lowHard 3–6 hours (shop) Community experience1,703 views

Source: Widely reported by owners. Not a GM statement. Confirm with a qualified technician.

When to stop driving

It's safe to drive if you track fuel by mileage. Don't rely on the gauge, and refuel early. Fuel work involves fire risk; leave tank work to a shop if you're not experienced.

Symptoms

  • Fuel gauge reads empty or full regardless of actual level
  • Gauge jumps or drops suddenly while driving
  • Low fuel warning with plenty of fuel in the tank
  • Range estimate in the DIC is way off

Likely causes

  • Contact wear or contamination on one or both level senders
  • Failed sender on one side
  • Wiring or connector problems at the tanks
  • Instrument cluster fault (less common)

What to check

Diagnostic steps, in order. Stop if any step needs tools or skills you don't have.

  1. 1Fill the tank completely and reset the trip meter. Note when the gauge starts behaving strangely.
  2. 2Watch how the gauge behaves as the level drops. Errors in a certain range often point to a worn spot on a sender.
  3. 3Track fuel use by miles driven so you don't run out while the gauge is unreliable.
  4. 4Have a shop read the sender values with a scan tool to see which side is wrong.
  5. 5Inspect wiring near the tanks for damage or corrosion.

Possible solutions

  • Replace the faulty fuel level sender (or both)
  • Some owners have had success with fuel additives; results vary and replacement is the reliable fix
  • Repair any wiring or connector damage

Parts commonly needed

  • Fuel level sender (left, right or both)
  • Tank seal or gasket
  • Connector or wiring repair parts (if damaged)

Warning signs

  • Gauge that slowly gets less accurate
  • Gauge that sticks at one reading
  • Range estimate that doesn't match miles driven

Prevention

  • Use quality fuel from busy stations
  • Don't routinely run the tank very low
  • Keep a note of miles per fill-up so you notice gauge drift early
Information here combines factory data and owner experience and may not apply to your exact car. For brakes, steering, suspension, fuel or anything safety-critical, consult a qualified mechanic. Read the full disclaimer.

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