The 2003 GMC Sierra has 32 electrical system complaints filed with NHTSA — 13% of the year's total, and up sharply from the prior model year.
32
Electrical System complaints
13%
Share of year
0
Crash-involved
1
Related recalls
Defect
CERTAIN CEQUENT 90 DEGREE 7-WAY RIGHT ANGLE ADAPTORS SOLD BY DISTRIBUTORS IN TOW PACKAGES FOR AFTERMARKET SALES TO TOW 5TH WHEEL RV TRAVEL TRAILERS. DUE TO INCORRECT WIRING OF THE HARNESS, THE TRAILER LIGHTS MAY NOT OPERATE PROPERLY.
Consequence
IF THE TRAILER LIGHTS ARE NOT WORKING PROPERLY, A VEHICLE CRASH CAN OCCUR.
Remedy
ALL OF THE DEFECTIVE TOW PACKAGES ARE STILL AT THE DISTRIBUTOR LEVEL AND HAVE NOT BEEN SOLD TO ANY CONSUMERS.
“ON MAY 31ST, THE REAR END DIFFERENTIAL ASSEMBLY EXPLODED SENDING THE PINON THRU THE HOUSING AND THE REAR AXLE CAUGHT ON FIRE. THE TRUCK WAS IN THE SHOP (PERRY CHEVEROLET, INC., COLUMBIA, MO)UNTIL 6-9-03. WHEN I ARRIVED IN BOZEMAN, MT ON 7-2-03 I WAS HAVING PROBLEMS WITH THE WIRING. THERE WAS A FIRE…”
NHTSA has 32 complaints about the 2003 GMC Sierra electrical system — 13% of all complaints filed for that model year.
Yes — 1 NHTSA recall campaign for this model year is tied to the electrical system: 07E066000.
Based on NHTSA ODI data through June 2026. Complaints are consumer-reported and unverified. Updated July 5, 2026.
Compiled by Sharon Ben-Moshe, Founder.