The Lemon IndexC1223 is a manufacturer-specific code, so its exact meaning depends on the make. Full C1223 page
19 owner complaints · the #2 code Toyota Sequoia owners name · 32% of Toyota Sequoia complaints that name a code (every car: 0.2%)
Middle of 78,000 miles · most between 52,000 and 85,000 (15 owners gave it)
Toyota Sequoia owners named C1223 in 19 complaints to the U.S. government (NHTSA), most often on the 2003, 2004 and 2005 model years, at a middle of 78,000 miles. The part they name most is the engine computer (ECM / PCM) (6 complaints). Complaints are owner reports, not proof of a defect.
Toyota Sequoia model years that report C1223
Owner complaints naming C1223, by model year. Raw counts: years that sold more get more complaints, so this is each model year's record, not a failure rate.
Mileage when it happened
78,000 miles is the middle of what 15 owners entered. Half were between 52,000 and 85,000 miles.
The mileage on the complaint form, when the owner gave one.
What owners say caused it or fixed it
The most-named part is the engine computer (ECM / PCM), in 6 of the 19 complaints (32%). 4 of those mention it being replaced or repaired. Next: ABS module, pump or accumulator (4).
- Engine computer (ECM / PCM)6 complaints4 mention a repair or replacement · what Toyota Sequoia owners paid
- ABS module, pump or brake accumulator4 complaints2 mention a repair or replacement · what owners paid
10 complaints mention a recall.
Counted from the owners' own words: a part counts when a sentence names it with a cause or repair word. What owners wrote, not a diagnosis. A shop should confirm the cause before replacing parts.
Symptoms owners describe with C1223
21% of these complaints say the check engine light came on.
- Brakes or ABS act up95%18 of 19 complaints
Share of the complaints naming C1223 whose text also describes each problem. A complaint can describe more than one.
Codes owners report with it
C1247 15 C1203 9 C1310 6 C1244 4 C1231 3 C1241 2
Other codes named in the same Toyota Sequoia complaints, and in how many.
Repair costs
Toyota Sequoia ECM (engine computer) replacement cost
Recalls on these Toyota Sequoia years
- Brakes · 2004, 2005, 2006 · issued 2007
CERTAIN CARDONE MASTER CYLINDERS WITH PART NUMBERS 10-2925, 10-2987, 10-2987MZA, 10-3083, 11-3015, 11-3042, 11-3044, 11-3045, 11-3047, 11-3064, AND 11-3156, AND WITH DATE CODES LOWER THAN DCA7078 SOLD AS REPLACEMENT EQUI… NHTSA 07E023000
1 recall for the same systems (brakes) on the Toyota Sequoia model years above. A recall for the same system isn't proof it's behind C1223. Recall work is free at any dealer: check a VIN at nhtsa.gov/recalls or with our VIN check.
Keep going
- C1223: meaning, causes and every car that reports it
- Toyota Sequoia reliability by year
- 2003 Toyota Sequoia problems and recalls
Other codes Toyota Sequoia owners report
The details
How we count
We read every owner complaint in the NHTSA file whose text names this trouble code, and count the ones filed about this model (matched by the make, model and model year on the complaint). Mileage is what the owner entered on the form.
Parts: a complaint counts for a part when one of the owner's own sentences names that part together with a cause word (failed, bad, diagnosed, caused by, leaking ...) or a repair word (replaced, repaired, new, reprogrammed ...). "Came back" means the same complaint also says the problem returned or the repair didn't fix it. These are counts of what owners wrote, not a diagnosis, and one complaint can name several parts.
Complaints are reports, not proof of a defect, and most owners never file one. Popular models get more complaints, so the counts are not a failure rate. The code meaning is the standard SAE J2012 definition in our own words, or the carmaker's meaning where we verified it for that make.
What C1223 means
C1223 is a manufacturer-specific code: each carmaker decides what it means, so the same code can point to different problems on different brands. We haven't verified its meaning for Toyota yet. A dealer or a scanner with the maker's software can tell you exactly.
Check the complaints yourself
NHTSA complaint numbers (search them at nhtsa.gov): 11229128, 10882175, 10781583, 10761707, 10555699, 10537465, 10531943, 10498116, 10471992, 10465098, 10391768, 10282816 and 7 more.
Quick answers
Which Toyota Sequoia years have the most C1223 complaints?
In complaints to NHTSA, owners of the 2003 (10), 2004 (4), 2005 (3) Toyota Sequoia named C1223 most (19 complaints in all, 2003–2006). Raw counts, not a failure rate.
What fixes C1223 on a Toyota Sequoia?
Owners most often name the engine computer (ECM / PCM) (6 of 19 complaints), then ABS module, pump or accumulator. That's what owners wrote, not a diagnosis: have a shop confirm the cause with a scan and tests before replacing parts.
At what mileage does C1223 show up on a Toyota Sequoia?
Owners who gave their mileage reported a middle of 78,000 miles; half were between 52,000 and 85,000 (15 owners).
Sources: NHTSA owner complaints that name C1223 on the Toyota Sequoia, counted by The Lemon Index; NHTSA recalls; repair bills owners named. Meanings: SAE J2012 in our own words. Owner reports, not a diagnosis or repair advice for your car.