2012 Toyota Tundra Electrical Problems

Odometer Fraud. The contact purchased a 2012 Toyota Tundra. At the time of the purchase, the mileage was 149,000. The vehicle was a dealer sale. An independent mechanic checked the vehicle history report and discovered a mileage discrepancy. The Carfax report indicated that the mileage was 379,000 in May 2025. The contact reported the odometer fraud to Wisconsin's Department of Transportation - Field Investigation Unit, which informed him that the odometer fraud was outside of their jurisdiction because the vehicle was purchased in Kentucky. The contact stated that the current approximate mileage was 395,000.

NHTSA ID

11747896

Incident

May 1, 2025

Mileage

395,000 mi

Odometer Fraud. The contact purchased a 2012 Toyota Tundra. The contact discovered a mileage discrepancy after the purchase. The vehicle was a private sale. At the time of purchase, the mileage was 137,355. The contact stated that while inspecting the glove box, the contact found three receipts that showed three different odometer readings. The contact then ordered a Carfax report and discovered that the mileage on the Title on October 4, 2025, was 252,307.

NHTSA ID

11710493

Incident

Jan 10, 2026

Mileage

252,307 mi

Odometer Fraud. The contact purchased a 2012 Toyota Tundra. The contact stated while attempting to register the vehicle, it was discovered that there was a mileage discrepancy. The vehicle was a private dealer sale. At the time of purchase, the vehicle mileage was 161,000 and at the time of registration, it was discovered that the mileage was 260,000.

NHTSA ID

11657369

Incident

Apr 28, 2025

Mileage

260,000 mi

Temperature Seat switches are not working, fire hazard does to malfunctioning.

NHTSA ID

11621690

Incident

Oct 24, 2023

Computer software issues. Flex full engine.

NHTSA ID

11495869

Incident

Dec 3, 2022

Secondary air injection pump has high rate of failure, recalls in older models. Has caused truck to go into limp mode. Could cause serious accident/fatality if vehicle suddenly goes into limp mode on highway. This has happened on multiple occasions in forums I’ve read. Known problem by Toyota that isn’t being addressed.

NHTSA ID

11487089

Incident

Sep 18, 2022

My horn stopped working. I have two new drivers and this is a huge safety concern of mine. The dealer is telling me that this is a $800 job. Online I'm finding that this is a very common issue that is occurring ... effecting the safety or our vehicle.

NHTSA ID

11463169

Incident

May 3, 2022

Started my truck and the 4lo, check engine and trac off lights came on. The 4lo was blinking.

NHTSA ID

11437939

Incident

Oct 24, 2021

2012 TUNDRA 4.6 V8 MY TRUCK WILL GO INTO LIMP MODE AND THE 4LO LIGHT FLASHES, CHECK ENGINE, AND TRAC OFF LIGHTS WERE ALL ON. ALMOST COMPLETE LOSE OF POWER WILL HAPPEN. IN TRAFFIC I END UP BLOCKING EVER VEHICLE BEHIND ME, BECAUSE THE TRUCK WILL NOT REACH THE SPEED LIMIT. IF THERE IS A HILL THEN THE TRUCK BARELY MOVES GOING UP THE HILL. AFTER LOOKING ONLINE I SAW IT'S A PRETTY COMMON PROBLEM ON TOYOTA WITH THE SECONDARY AIR INJECTION PUMP SEIZING. I CHECKED IT WITH THE CODE READER AT A LOCAL SHOP AND THE GUY CONFIRMED IT, CODE P2240 "AIR INJECTION SWITCHING VALVE STUCK OPEN BANK 1." HE TOLD ME HE USED TO WORK FOR TOYOTA AND KNEW THERE WAS THE EXTENDED REPAIR ON THIS ISSUE BUT COULDN'T RECALL THE SPECIFICS. I WENT INTO TOYOTA AND UNFORTUNATELY THEY WILL NOT COVER IT FOR MY TRUCK AFTER THEY RAN MY VIN NUMBER. IT SEEMS LIKE A LOT OF TUNDRAS WITH THE 5.7L MOTOR ARE COVERED BUT THE 4.6L MOTORS ARE NOT. I WAS INFORMED BY TOYOTA THAT IN THE FUTURE IT MIGHT BE COVERED.

NHTSA ID

11319365

Incident

Jul 10, 2019

Mileage

96,000 mi

TL* THE CONTACT OWNS A 2012 TOYOTA TUNDRA. THE CONTACT STATED THAT THE VEHICLE WAS AT STAND STILL, THE IGNITION HESITATED TO START THE VEHICLE. THE CONTACT STATED HE REPLACED THE BATTERY BUT CONTINUED TO EXPERIENCE THE FAILURE. THE VEHICLE WAS TAKEN TO INDEPENDENT MECHANIC AND HAD THE STARTER AND ALTERNATOR INSPECTED. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED AS OF YET. A DEALER WAS NOT CONTACTED. THE VEHICLE CONTINUE TO EXPERIENCE THE FAILURE. THE MANUFACTURER HAD NOT BEEN INFORMED OF FAILURE. THE FAILURE MILEAGE WAS 86,000.

NHTSA ID

11300877

Incident

Oct 1, 2019

Mileage

86,000 mi

HORN STOPPED WORKING CHECKED ALL ASSOCIATES FUSES AND RELAYS APPEARS TO BE WIRING ISSUE IN THE STEERING COLUMN

NHTSA ID

11181509

Incident

Dec 14, 2018

Mileage

105,000 mi

CODE P0418 SECONDARY AIR INJECTOR CODE KEEPS COMING ON - AND IS A KNOWN PROBLEM. 2011 TUNDRAS WERE RECALLED FOR THIS - SO SHOULD 2012 TUNDRAS

NHTSA ID

11129497

Incident

Jun 1, 2018

Mileage

90,000 mi

TRUCK IN LIMP MODE. WOULD NOT EXCEED 40MPH. VEHICLE LIMPED HOME AND TOWED TO DEALER. RODENTS HAD CHEWED ELECTRICAL WIRES PER TOYOTA DEALER. UPON INVESTIGATION TOYOTA BEGAN USING SOY-BASED WIRING IN THEIR VEHICLES INSTEAD OF PETROLEUM-BASED AND DIDN'T NOTIFY THEIR CUSTOMERS. SOY-BASED PRODUCTS IN VEHICLES HAVE BEEN KNOWN TO "ATTRACT" RODENTS VERSUS PETROLEUM BASED PRODUCTS. MY 2012 TUNDRA WAS STILL UNDER WARRANTY AND TOYOTA DENIED SAID WARRANTY BECAUSE IT WASN'T A "FAILURE" OF THEIR PARTS. THE VEHICLE WOULD NOT ACCELERATE PROPERLY OR STEER PROPERLY BECAUSE THE TRACTION CONTROL AND ECM HAD FAILED. THIS COULD CAUSE SERIOUS INJURY OR HARM DUE TO AN UNSUSPECTING INTERRUPTION IN SPEED AND TRAFFIC FLOW, AS A RESULT OF WIRING SEPARATION OCCURRING WHILE OPERATING THE VEHICLE.

NHTSA ID

11004708

Incident

Jun 16, 2017

Mileage

47,000 mi

THIS TRUCK HAS CONTINUED TO HAVE ELECTRICAL PROBLEMS BECAUSE RATS GET IN THE ENGINE AND EAT THE WIRES. THIS ISSUE ALWAYS HAPPENS WHEN THE TRUCK IS PARKED. THIS TIME THE RATS ONLY MADE A NEST BUT THE LAST TIME COSTS ME ABOUT $1200.

NHTSA ID

10897837

Incident

Aug 18, 2016

Mileage

12,000 mi

ON 4/5/16, I STARTED MY 2012 TUNDRA TO GO TO WORK. ENGINE LIGHT COMES AND STAYS ON. CALLED LOCAL DEALER AND TOOK THE TRUCK IN. 5 HOURS OF DIAGNOSTIC TESTING REVEALS CODE P0418 (SECONDARY AIR INTAKE SYSTEM) ISSUE ON MY 2012 TUNDRA. COST OF REPAIRS, $2048.00. AFTER SOME RESEARCH INTO THIS CODE P0418, I FIND THAT IT IS A REOCCURRING PROBLEM FOR TUNDRAS, TACOMAS AND SEQUOIAS DATING BACK TO 2000 - 2010. REPAIR COSTS OF UP TO $4,000. SUPPOSED TO BE RESOLVED IN 2011 + MODELS. NOT SO. IF THIS IS NOT CORRECTED, THE TRUCK COULD GO INTO LIMP MODE, RESTRICTING POWER AND DEPENDING ON WHERE THIS OCCURS, COULD LEAD TO A DANGEROUS SITUATION. NO WAY PREVENTATIVE MAINTENANCE WILL HELP IDENTIFY THIS ISSUE. I CALLED TOYOTA CUSTOMER SERVICE AND THEY (TOYOTA) WERE WILLING TO PAY FOR HALF OF MY REPAIRS, WHICH I APPRECIATE. HOWEVER, THEY KNEW THIS WAS A PROBLEM DATING BACK TO 2000, MADE ATTEMPT TO CORRECT AND STILL AN ISSUE. SEEMS LIKE THIS SHOULD BE INVESTIGATED FURTHER BASED ON THE FACT THAT THIS CONTINUES TO PLAGUE OWNERS.

NHTSA ID

10854010

Incident

Apr 5, 2016

Mileage

87,992 mi

ELECTRICAL BUZZING NOISE FROM DASH AREA WHEN PRESSING GAS PEDAL. DEALER SAYS NOT A WARRANTY ITEM. AFTER RESEARCHING ONLINE MANY PEOPLE EXPERIENCE SAME ISSUE WITH SEVERAL TOYOTA MODELS. *TR

NHTSA ID

10574300

Incident

May 16, 2013

Mileage

7,200 mi

AS I WAS DRIVING, ANOTHER VEHICLE STARTED VEERING INTO MY LANE. I PRESSED THE HORN PAD TO WARN THEM. HOWEVER, BECAUSE I USED MY RIGHT HAND AND HIT THE PAD AT THE MOST NATURAL LOCATION FOR ME -- I.E. THE LOWER RIGHT PORTION, INSTEAD OF HONKING THE HORN I HIT THE HANDS FREE TALK SWITCH ON THE STEERING HUB. THIS HAS HAPPENED MORE THAN ONCE. THIS IS A NATURAL LOCATION TO HIT THE HORN PAD AND OTHER PEOPLE I HAVE TALKED TO HAVE HAD THE SAME PROBLEM. IN MY VIEW THIS IS AN UNSAFE SITUATION BECAUSE, NOT ONLY DO YOU NOT WARN THE OTHER VEHICLE BUT YOU ALSO GET DISTRACTED AT A TIME OF POSSIBLE EXTREMIS. IT IS BAD DESIGN AND NEED TO BE CORRECTED;. *TR

NHTSA ID

10535259

Incident

Aug 13, 2013

Mileage

22,000 mi