DTC P0010800 – Manifold Absolute Pressure (MAP) / Barometric Pressure – High Input.

✅ DTC P0010800 – MAP / BARO Pressure High Input

This code means the ECM is detecting a MAP or Barometric Pressure sensor voltage that is higher than the expected range.
High input = High voltage signal = Sensor reading too high pressure.

🔧 Common Symptoms

Hard starting (mostly rich condition)

Black smoke / rich fuel mixture

Poor fuel economy

Lack of power

Rough idle

Turbo engines: low boost / overfueling

Check engine light ON

🎯 Main Causes

1. MAP Sensor issues (very common)

Sensor internally shorted

Sensor stuck reading high pressure

Contaminated MAP port (oily air, PCV vapors)

2. Wiring Problems

MAP signal wire shorted to 5V reference

Open ground wire

Poor connector contact

Corrosion on terminals

3. Intake System Issues

Intake manifold leaks after MAP sensor

Boost pressure unusually high (turbo vehicles)

4. Engine Control Module (ECM)

Rare – signal interpretation error

ECM reference voltage issue (5V too high)

🔍 Expected MAP Sensor Values

Engine OFF (Key ON)

MAP = Barometric pressure

Typically 95–102 kPa (varies by altitude)

Signal voltage ≈ 4.0–4.5V

Engine Idling

Normal vacuum = 30–40 kPa

Signal voltage ≈ 1.0–1.8V

If voltage stays at 4.5–5V, the ECM sets high input.

🧰 Step-by-Step Diagnostic Procedure

1. Visual Inspection

Check MAP connector fit

Look for oil contamination inside MAP port

Inspect vacuum hose (if external MAP, not manifold-mounted)

Check wiring near engine/heat sources

👉 If hose collapsed or cracked → replace.

2. Scanner Live Data Check

Compare MAP vs BARO with key ON:

If MAP = 250–260 kPa or constant 4.5–5V, sensor/wiring is faulty.

If BARO is also wrong → faulty 5V reference or ECM.

3. Test MAP Sensor Voltage (multimeter)

Pin Layout (most MAP sensors):

5V Reference

Ground

Signal Wire

Check:

✅ Reference voltage: Should be 5V

If higher (5.5–6V) → ECM issue.

✅ Ground: Should be 0V

Bad ground = high signal.

✅ Signal voltage (engine OFF):

Should be 4–4.5V

If 5V, signal wire is shorted to 5V.

4. Check for Wiring Short

Unplug MAP sensor → read signal voltage at the connector.

If signal wire still shows 5V → short to 5V ref

If signal drops to 0–0.5V → MAP sensor defective

5. Substitute with a Known Good MAP Sensor

Fastest way to confirm.

6. Check Intake Manifold Pressure (Turbo Engines)

If boost pressure is abnormally high:

Faulty boost control valve

Wastegate stuck closed

Boost leak before MAP

Unusual but possible cause.

🛠 Fixes

Most Common Repairs

Clean or replace MAP sensor

Repair signal or ground wire

Replace cracked vacuum hose (external MAP)

Clean intake manifold port

Fix boost control issues

ECM replacement (only after confirming all else)

📌 Quick Tips for Workshop

If MAP and BARO readings both abnormal → check 5V reference first.

Remove MAP sensor and inspect for oil contamination (common in diesel / turbo engines).

Always clear codes and perform a road test to confirm fix.

Welcome To Madurai Car Service 💐🙏🏻.