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Diagnostic trouble code

P1A77

P1A77 Fault Code

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Car Codes diagnostic trouble code

P1A77Diagnostic priority

…e Condition) a. Misdiagnosis due to insufficient margin of pressure deviation when driving at constant speed with low engine load i. Logic improvement to eliminate misdiagnosis 2. P1A77 (Check Generator Belt) a. Misdiagnosis due to poor synchronization release when the engine is stopped i. Logic improvement to release synchronization even if CAM signal is active when engine is stopped 3. P00B7 (Engine Coolant Flow Low/Performance) a. ITM con…

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Code interpretation

What P1A77 means

This code indicates Vehicle fault code with verified manufacturer evidence Its precise meaning depends on the reporting control module, complete failure-type suffix, model year, powertrain and software level.

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Driver experience

Symptoms you may notice

A stored diagnostic trouble code or a related system warning.

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Test, do not guess

Possible causes

The precise cause depends on the reporting module, vehicle specification, circuit condition and software level.

Evidence-led checks

Recommended diagnostic route

Save the complete scan and confirm the code against model-specific technical information before testing.

  1. Capture the evidenceSave the complete all-module scan, code suffixes and freeze-frame data.
  2. Prove the basicsTest battery condition, system voltage, power and grounds.
  3. Identify the reporterConfirm the module that logged the code and check circuit integrity.
  4. Compare live dataReview commanded and actual values under the conditions that set the code.
  5. Test before replacingUse model-specific wiring diagrams, pin tests and technical information.
  6. Verify the repairClear the code only after recording evidence, then confirm it does not return.

Vehicle fitment

Vehicle applicability

Hyundai Santa Fe, Hyundai Tucson

Before clearing

Can the code be cleared?

Clearing a code without fixing the cause removes useful evidence and may only switch the warning off temporarily. Save the full scan first; a permanent or repeatedly returning code needs testing.

A DTC is evidence, not a parts order.

Confirm the suffix, reporting module, model, year, engine and live data before replacing a component.

Verified public evidence

Manufacturer and model coverage

5 public manufacturer records match this search. These records support applicability research but do not replace VIN-specific workshop information.

P1A77Hyundai Santa Fe
SANTA FE HYBRID · 2022 · Powertrain

…Santa Fe Plug-In Hybrid (TM PHEV) and Tucson Hybrid (NX4 HEV) / Tucson Plug-In Hybrid (NX4 PHEV) vehicles to revise the following DTC logic: P1441(PCSV rear and hose missing) P1A77(HSG…

Source
P1A77Hyundai Santa Fe
SANTA FE PLUG-IN HYBRID · 2022 · Powertrain

…Santa Fe Plug-In Hybrid (TM PHEV) and Tucson Hybrid (NX4 HEV) / Tucson Plug-In Hybrid (NX4 PHEV) vehicles to revise the following DTC logic: P1441(PCSV rear and hose missing) P1A77(HSG…

Source
P1A77Hyundai Santa Fe
SANTA FE HYBRID · 2021 · Powertrain

…rol Module (ECM) software update for Santa Fe Hybrid (TM HEV) / Santa Fe Plug-In Hybrid (TM PHEV) vehicles to revise the following DTC logic: P1441(PCSV rear and hose missing)…

Source
P1A77Hyundai Tucson
TUCSON HYBRID · 2022 · Powertrain

…e Condition) a. Misdiagnosis due to insufficient margin of pressure deviation when driving at constant speed with low engine load i. Logic improvement to eliminate misdiagnosis 2. P1A77 (Check Generator…

Source
P1A77Hyundai Tucson
TUCSON HYBRID · 2022 · Powertrain

…Santa Fe Plug-In Hybrid (TM PHEV) and Tucson Hybrid (NX4 HEV) / Tucson Plug-In Hybrid (NX4 PHEV) vehicles to revise the following DTC logic: P1441(PCSV rear and hose missing) P1A77(HSG…

Source